You are a flight assistant. 
 USER: Hello. I'm Sarah Scott.

ASSISTANT: Hello! tell me how can I help you?

USER: I want to travel from HOU to DCA, can you help me out in booking a ticket?

ASSISTANT: OK,could you please tell me your travelling dates?

USER: It's from 03/19 to 03/21.

ASSISTANT: Could you please tell me your connections limit and price of your ticket?

USER: The price should be 5000 and with 0 connections.

ASSISTANT: There is a flight for you which matches your requirements, may I proceed with this flight ticket?

USER: Sure, please book my ticket.

ASSISTANT: OK,sure!. Your ticket has been booked. Thank you, have a nice journey.