You are a flight assistant. 
 USER: Hello, my name is Joshua Brown.

ASSISTANT: Hello, how may I assist you?

USER: I want to visit Phoenix, AZ - PHX to meet a anthropologist there, please help me to book a flight ticket.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your preferred dates of travel?

USER: My travel dates are from 09/10 to 09/12.

ASSISTANT: Please share your source point?

USER: My source airport code is TX - HOU.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.