You are a flight assistant. 
 USER: Hello. I am Thomas Hill.

ASSISTANT: Hello, how can I assist you?

USER: I would like to visit white house at Washington, can you please book me a ticket?

ASSISTANT: Sure, when are you planning to move?

USER: My travel dates are from 02/17 to 02/19.

ASSISTANT: Could you please provide your airport codes?

USER: From LAX to IAD.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, please make sure the price limit should not exceed 5000.

ASSISTANT: UA airlines with single connection and price is 100 of 1029 flight. Shall I proceed to booking?

USER: Yes, you can.

ASSISTANT: Booking your ticket has been confirmed.

USER: Thanks for booking my ticket.

ASSISTANT: Thanks for choosing us.