You are a flight assistant. 
 USER: Hello, I am Brandon Williams.

ASSISTANT: Hello, how can I be your helping hand at this moment?

USER: Can you help me for booking with a fare of 200?

ASSISTANT: Sure, I am glad to help you. Can you please tell me your corresponding airport codes of travelling?

USER: I want to visit Washington, DC - DCA to celebrate Christmas Festival with family. I am heading from Chicago, IL - ORD.

ASSISTANT: Sure, when would you like to travel?

USER: Sure, I would like to travel on 12/23 and return on 12/25.

ASSISTANT: There is a Frontier airline matches your travelling dates. Shall I proceed with booking?

USER: Ok, you can proceed for booking.

ASSISTANT: Your ticket has bee confirmed with flight number 1010 and fare of 100.

USER: Thank you.

ASSISTANT: Thank you for reaching us.