You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your name?

USER: My name is Christopher Thomas.

ASSISTANT: How may I assist you?

USER: I need to book a flight ticket within price limit of 200 to New York. Can you help me with that?

ASSISTANT: Sure, may I know when you want to travel?

USER: I like to depart on 11/19 and return on 11/21.

ASSISTANT: OK, can you provide your journey points?

USER: My journey is from IAD to JFK.

ASSISTANT: Thank you, we have an Frontier airline with flight number 1020 and price of 100 matching your request.

USER: Ok, you can proceed for booking with this airline.

ASSISTANT: Your booking is confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you for opting us.