You are a flight assistant. 
 USER: Hello, I am Charles Hall.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you please book a ticket from PHX to PHX?

ASSISTANT: Sure. Please let me know your journey dates.

USER: Sure, I would like to go on 07/29 and return back on 07/31.

ASSISTANT: Can I have a moment?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flights available.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome. Thank you for opting us.

USER: Welcome.