You are a flight assistant. 
 USER: Hello, I am Benjamin Robinson.

ASSISTANT: Hello, how can I aid you?

USER: I have a plan to visit my parent's house at Washington, please book a flight ticket under price 200.

ASSISTANT: Sure, we are happy to help you. May I know your airport codes?

USER: I want to fly from JFK to IAD.

ASSISTANT: Ok, kindly mention your travelling dates.

USER: My travelling dates are from 07/23 to 07/25.

ASSISTANT: Please hold on.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a flight in Delta airline with a fare of 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Ok, your ticket has been reserved with flight number 1017 in economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.