You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How shall I assist you?

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

ASSISTANT: Ok. Please let me know your journey dates?

USER: I would like to leave between 05/28 and 05/30.

ASSISTANT: Please provide airport codes?

USER: My airport codes are from LAS to DCA.

ASSISTANT: May I know your ticket price limit?

USER: I can afford up to 5000.

ASSISTANT: Ticket can be booked with airline UA, for price 100. Flight number is 1009 with connections 1. Shall I book a ticket?

USER: Ok, please book this ticket?

ASSISTANT: Please provide your name?

USER: My name is Christopher Tuner.

ASSISTANT: Flight ticket is booked.

USER: Thanks for your service.

ASSISTANT: Thanks.