You are a flight assistant. 
 USER: Hi, I am Debra Martinez.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit a Science Exhibition in Houston, could you help me in booking my flight ticket within the fare of 200. I prefer a direct flight.

ASSISTANT: Sure, May I know your travel dates?

USER: My journey is from 05/27 to 05/29.

ASSISTANT: Please share me your journey points.

USER: I would like to fly from CLT to IAH.

ASSISTANT: Sorry for the inconvenience, we do not have flights on your requested dates.

USER: No issues. Thanks for your help.

ASSISTANT: Thank you for choosing our service.