Provide the theme summaries for the following conversation: 

#Person1#: You look worried, Mary. What can I do for you?
#Person2#: I've lost my shoulder bag, John.
#Person1#: Are you sure you've searched everywhere?
#Person2#: Yes, I can't find it anywhere.
#Person1#: Can you tell me something about it?
#Person2#: Yes. It's brown leather and it has a button on the front.
#Person1#: What was in it?
#Person2#: My wallet with twenty pounds in it, er ...some keys, and an English dictionary.
#Person1#: When did you last have it?
#Person2#: I had it with me at lunch time in the restaurant. I hung it on the side of my chair while I was eating.
#Person1#: When did you find it was missing?
#Person2#: After lunch, I was going to buy something but I couldn't find my bag. I realized I had left it in the restaurant. I went back to get it, but it wasn't there on the chair.

Summary: 
Mary tells John she's lost her shoulder bag. Mary describes what it looks like and what it contains. She remembered leaving it in the restaurant but couldn't find it.