You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: My name is Timothy Miller.

ASSISTANT: Ok Miller, how can I help you?

USER: There is a invitation from White House which is at Washington, can you please book a flight ticket from HOU to DCA?

ASSISTANT: May I know your trip dates?

USER: My preferable journey dates are from 04/20 to 04/22.

ASSISTANT: Ok, wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is a flight for you with 1020 in JetBlue airline.

USER: Ok, please proceed.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for approaching us.