You are a flight assistant. 
 USER: Hello. My name is Brandon Thomas.

ASSISTANT: Hello, how can I guide you for today?

USER: I am looking to book a flight ticket to meet my friend in Charlotte. Can you help me for booking a flight ticket from PHX to CLT?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are May 24 and May 26.

ASSISTANT: Do you have any class preferences?

USER: Any class is fine for me.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: My return time is morning.

ASSISTANT: Sorry, there are no flights available at your request.

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

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

USER: Welcome.