You are a flight assistant. 
 USER: Hi, my name is Justin Lewis.

ASSISTANT: Hello. How may I help you?

USER: I would like to travel from LGA to ATL to see the art gallery in Atlanta, could you book a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My departure day is on 11/09 and returning on 11/11.

ASSISTANT: Ok, wait a moment I will check your flight availability.

USER: Sure.

ASSISTANT: Sorry to say that, no flight found for your request.

USER: Really not good to hear that one, anyway thank you for your information.

ASSISTANT: Welcome, have a nice day.

USER: Thank you.