Provide the theme summaries for the following conversation: 

#Person1#: Good afternoon, Mr. Meng! It's nice to see you today. It's been a while, hasn't it?
#Person2#: Hello, Miao Ping. Yes, it has. I've been in Saudi Arabia for the last 6 weeks on business. I did have a little time to relax in Dubai, though.
#Person1#: I envy you, Mr. Meng! What can I do for you today?
#Person2#: I need to effect a payment under my L / C. Not the old one, the new one my Assistant came in and dealt with last week.
#Person1#: Right. Do you have the code for that one?
#Person2#: It's DG193445782100. Can you find it?
#Person1#: Here it is. Have you got the advice slip with you? You have sufficient funds in the account, so we can go ahead.

Summary: 
Mr. Meng tells Miao Ping about Mr. Meng's business trip to Saudi Arabia. Miao Ping helps Mr. Meng to effect payment under Mr. Meng's L/C.