You are a flight assistant. 
 USER: Hi, I  am Charles Evans.

ASSISTANT: Hello, how may I help you for today?

USER: I want to attend a live concert which is held on 12/23 and return on 12/25, can you help me in booking flight ticket?

ASSISTANT: Sure, may I know your price limit to book a ticket?

USER: Yes, my price should be under 500.

ASSISTANT: Ok, could you please share your airport codes?

USER: I would like to travel from AZ-PHX to WA-SEA.

ASSISTANT: Ok, there is a flight 1003 in Frontier airline matching your requirements with price 100. Shall I proceed with this airline?

USER: Yes, please proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Thanks for reaching us. Have a safe journey!.