You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Joshua King, want to travel from BOS to PHX. Please help me in booking my ticket.

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my travelling dates are from 02/04 to 02/06.

ASSISTANT: Sorry to say, no flight is available for you.

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

ASSISTANT: Thank you for reaching us, have a nice day.