You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Debra Roberts. I want to book a flight ticket from DC-IAD to TX-HOU. Can you help me with this booking?

ASSISTANT: Sure, may I know your trip dates?

USER: 09/27 and 09/29 are my travelling dates.

ASSISTANT: Do you have any other preferences?

USER: 200 is my fare.

ASSISTANT: Hold on a minute.

USER: Ok.

ASSISTANT: We found a flight on frontier airlines, flight number as 1002 with the fare of 200. Shall I book it?

USER: You can reserve it.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.