You are a flight assistant. 
 USER: Hi, I am Ronald Smith from Houston.

ASSISTANT: Hello. How can I aid you?

USER: I would like to book a flight within a fare of 200 to Washington, so assist me in booking a flight to DC - DCA.

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Where would you like to start from?

USER: I would like to start from TX - IAH.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are on 08/22 to 08/24.

ASSISTANT: We found a Delta airline, flight number:1008 and the price is 100.

USER: That's fine, you can proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.