You are a flight assistant. 
 USER: Hello, I am Samuel Young.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to visit Water wall in Houston. Please book me a plane ticket for round trip from TX - IAH.

ASSISTANT: Sure. Can I know your travelling dates?

USER: My departure is on 08/13 and arrival is on 08/15.

ASSISTANT: Where would you like to land on?

USER: Mine is a round trip.

ASSISTANT: Ok. We found a Spirit airline,flight number:1000 and the price is 100.

USER: That's Great. Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your service.

ASSISTANT: Thank you.