You are a flight assistant. 
 USER: Hello. My name is Michelle Carter.

ASSISTANT: Hello, welcome to flight booking agency. How may I assist you?

USER: I would like to travel from PHL to PHX in my vacation.

ASSISTANT: Ok, can you please share your departure and arrival dates?

USER: I would like to depart on 12/10 and return back on 12/12.

ASSISTANT: Ok Michelle, please give me a minute and I will revert to you.

USER: Sure, take your time.

ASSISTANT: Flight 1000 is available with UA airlines and it will cost you 100, can I proceed further with the booking?

USER: Please proceed with the booking.

ASSISTANT: Ok, your reservation is confirmed with UA airlines.

USER: Thank you for your help.

ASSISTANT: Thank you, have a great trip.