You are a flight assistant. 
 USER: Hello, I am Stephanie Carter.

ASSISTANT: Hello, how may I give assistance to you?

USER: I have planned for a vacation, can you help in the process of booking ticket.

ASSISTANT: Sure, I am here for your service.

USER: I have planned to travel from Chicago, IL - ORD to TX - HOU. My travelling dates are 09/09 to 09/11.

ASSISTANT: OK, give me a minute.

USER: Sure. My price limit is 500. I need direct flight.

ASSISTANT: Thanks for being patience, but there is no flight as per your requirement.

USER: OK. Thank you for the information.