You are a flight assistant. 
 USER: Hello. My name is Jessica Roberts.

ASSISTANT: Hello, how may I guide you?

USER: I would like to travel from HOU to PHX, could you help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are from 04/11 to 04/13.

ASSISTANT: I am sorry, there are no flights available.

USER: Please proceed with the booking. That's ok.

ASSISTANT: Thank you.

USER: Thank you, have a good day.