You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Alexander Perez here. I want to go to CLT on 06/13. Can you book my ticket?

ASSISTANT: Sure Perez, can I know the return date and source code please?

USER: My nearest airport code is DCA and return date will be on 06/15.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: There is a flight in Frontier airline with price 200. Can I book it?

USER: Please go ahead.

ASSISTANT: Your ticket has been booked with flight number 1010.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.