You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, your good name please?

USER: I am Sarah Clark.

ASSISTANT: Thank you. How can I serve you best today?

USER: I want to book a flight ticket to Charlotte to visit US National Whitewater Center with my friends.

ASSISTANT: OK.

USER: My starting point is at Houston, HOU. Destination airport code is CLT.

ASSISTANT: Please provide your travel dates that you have planned?

USER: I have planned my travelling on 08/05 and 08/07.

ASSISTANT: Ok, may I know your price limit?

USER: Price limit is 1000. I need a direct flight.

ASSISTANT: Ok, please wait. I will check with airlines and revert to you. Sorry, no direct flights are available on your preferred dates.

USER: Sure. Ok, thanks for your information.

ASSISTANT: Thanks for reaching us, have a great day.