You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Timothy Perez.

ASSISTANT: Ok.

USER: I wish to go for my friend's wedding at Chicago, ORD. Can you please book a ticket on 03/11?

ASSISTANT: Sure, may I know your source code please?

USER: Source code is Los Angeles, LAX.

ASSISTANT: May I know your return date please?

USER: I will return back on 03/13.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your trip dates.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.