You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Ryan Moore, want to travel from BOS to PHL. Please help me in booking my ticket.

ASSISTANT: May I know your trip dates?

USER: My travelling dates are from 06/07 to 06/09.

ASSISTANT: There is no flights available.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.