Provide the theme summaries for the following conversation: 

Marika: What time will you be arriving
Stephen: The train is due to arrive into St Pancras at 10.44
Marika: Ok great, I will meet you there
Marika: Do you fancy grabbing some brunch? There is a great little place in Camden Market?
Stephen: Yes that sounds great!
Marika: What else would you like to do whilst you are in London? 
Stephen: I think Freda would like the science museum - she is really into maths at school. 
Marika: Yes it is a very interesting place
Stephen: Freda hasn't been to London before so I would like to show her Buckingham Palace,Big Ben and all that stuff.....
Marika: Perhaps we could go for a trip on the Thames?
Stephen: Yes that would be lovely
Marika: Do you want to take in a show too? Mildred is on at the moment.
Stephen: Freda would love that. Are the tickets very expensive though?
Marika: I am not sure. Sometimes they have special deals. I will check and let you know.
Stephen: Seems strange coming to visit as a tourist when I used to live here...
Marika: I know. I am sure we can visit some of your old haunts too!
Stephen: I used to love Camden Market but it has changed so much. Last time I went I didn't even recognise it.....good memories
Marika: We shall make some new ones.  See you soon. Hugs and kisses!
Stephen: Yes, bye for now

Summary: 
Stephen and Marika will grab some brunch after he arrives at St Pancras at 10.44. Stephen wants to take Freda to Science Museum and show her Buckingham Palace, take a trip on the Thames and take in a show. Stephen used to live in London, Freda has never been here before. 