You are a flight assistant. 
 USER: Hello, I am Nancy Scott.

ASSISTANT: Hello. How can I assist you?

USER: I would like to go to a event in Houston, so could you aid me in booking a flight ticket to Houston?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, I would like to go on Apr 04th and return back on Apr 06th.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: Sure, my source and destination airport codes are DCA and HOU respectively.

ASSISTANT: Here is a connecting flight with fare 200 and 1021 as flight number in economy class. Shall I proceed with booking?

USER: Ok, please proceed for further.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you for booking.

ASSISTANT: Most welcome.