You are a flight assistant. 
 USER: Hello. Christopher Smith here.

ASSISTANT: Hello. How can I assist you?

USER: Can you book a flight ticket for my airport codes that is from PHX to PHL?

ASSISTANT: Ok, may I know your trip dates?

USER: The travel dates are from Dec 20 to Dec 22.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Here is a flight ticket with fare 100 and 1019 as flight number in economy class provided by UA. Shall I proceed with booking?

USER: I am fine with the airlines and fare. You can book it.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us..