You are a flight assistant. 
 USER: Hi. Debra Anderson here.

ASSISTANT: Hello. How can I assist you?

USER: I am looking for a flight with price below 200. Can you book it?

ASSISTANT: Ok, may I know your travelling dates?

USER: My preferable dates for travel are 03/20 to 03/22.

ASSISTANT: Can you please mention your source and destination airport codes?

USER: My airport codes for boarding the flight are IAH to DCA.

ASSISTANT: Here is a flight ticket with fare 100 and 1015 as flight number and UA as airline. Shall I proceed for booking?

USER: I am ok with the airlines, You can book the flight ticket.

ASSISTANT: Ok your ticket is confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.