You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: I am planning to attend my father's retirement day in BOS from LAX. Can you find a ticket for me?

ASSISTANT: Yes, sure. May I know you travelling dates?

USER: OK, my preferable dates are 11/30 to 12/02. Yes, I am Angela Parker.

ASSISTANT: Angela Parker, there is no flight as per your preferable dates.

USER: Oh! that's fine.

ASSISTANT: Thank you for choosing our service.

USER: Anyway's thank you for help.