You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Thomas Hill, want to travel from PHX to DEN. Please help me in booking my ticket.

ASSISTANT: Sure, please let me know your budget for this booking.

USER: My budget should not exceed more than 1000.

ASSISTANT: On what dates are you planning to travel?

USER: My travelling dates are from 02/17 to 02/19.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for sharing your details. Currently there are no flights going on your way.

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

ASSISTANT: Thank you for picking us.