You are a flight assistant. 
 USER: Hello. I am Jack Martinez.

ASSISTANT: Hello, how may I serve you for the day?

USER: I am planning to travel from IAD to DCA. Can you please help me to book a ticket/.

ASSISTANT: Sure, we will help you. May I know at what price you are looking for flight ticket?

USER: I can afford upto 5000.

ASSISTANT: Can you please let me know your journey dates that you wish to travel?

USER: My travelling dates will be on 08/20 to 08/22.

ASSISTANT: Thank you for sharing your details, please wait for a while.

USER: Ok.

ASSISTANT: We found a direct flight with Delta airlines, and the fare of 500. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Ok, your ticket has been reserved with 1028 flight number in economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing our services.