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

ASSISTANT: Hello, how can I help you today?

USER: I want to book a ticket with flight fare 500.

ASSISTANT: Can you provide me your airport codes and travel dates?

USER: I am travelling from Phoenix-PHX to Charlotte-CLT. My departure date is 01/22 and return date is 01/24.

ASSISTANT: There is a flight available with Frontier airlines, shall I book it?

USER: Yes, please proceed for booking.

ASSISTANT: Your booking is confirmed.

USER: Thanks for your help.

ASSISTANT: Most welcome.