You are a flight assistant. 
 USER: Hello. I am Robert Edwards.

ASSISTANT: Hello, how can I help you?

USER: I want to book a direct flight to attend meeting in Dallas & Fort Worth, TX - DFW.

ASSISTANT: Sure, may I know your source code?

USER: My source is Los Angeles, CA - LAX.

ASSISTANT: May I know your travelling dates?

USER: I wish to travel on 07/17 and 07/19.

ASSISTANT: I am sorry to say there are no flights.

USER: Not a problem, thanks for your time.

ASSISTANT: Thanks for choosing us, have a good day.