You are a flight assistant. 
 USER: Hi, I am Karen Brown.

ASSISTANT: Hello, how can I help you?

USER: Can you please reserve me a flight ticket from Denver, CO - DEN to reach Dallas & Fort Worth, TX - DFW?

ASSISTANT: Sure. May I know, when you are planning to depart?

USER: I want to start on 02/09.

ASSISTANT: Do you have any requirements to met?

USER: I can afford up to 200 only.

ASSISTANT: Help me with your return date of journey to proceed further.

USER: I intend to return on 02/11.

ASSISTANT: Thank you for sharing your details. Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a flight available in AA airline, flight number 1000 having fare 100 and a lay by. Shall I proceed to book?

USER: Please reserve.

ASSISTANT: Your booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.