You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: On my name Benjamin Miller, can you book a ticket to Chicago, ORD?

ASSISTANT: Sure, I will help you with booking.

USER: Ok.

ASSISTANT: Please mention the source airport code?

USER: I will start from Washington, DCA to exhibit my paintings in Chicago.

ASSISTANT: May I know you need any halt in between the journey?

USER: I am comfortable with any flight.

ASSISTANT: Please share me on what dates would you like to travel?

USER: My scheduled dates are 05/07 to 05/09.

ASSISTANT: May I know how much you like to spend on flight ticket?

USER: I can spend an amount of 200.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, I found a flight of airline UA but fare is 800. Do you like to proceed with booking?

USER: I can not spend amount 800 to a ticket, do not proceed.

ASSISTANT: Ok.

USER: Thanks for the prompt response.

ASSISTANT: Thank you for visiting us, we hope see you again.