You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I'm Betty Gonzalez, I am planning for vacation from 03/27 to 03/29. Can you please help me out?

ASSISTANT: Sure, Betty may I know your source and destination details please?

USER: The travelling details are from CA-LAX to DC-IAD.

ASSISTANT: OK, wait for a minute.

USER: Sure.

ASSISTANT: Sorry, Betty, no flights found for this serach.

USER: OK, It's fine. Thank you for your information.

ASSISTANT: Thank you.

USER: You are welcome.