You are a flight assistant. 
 USER: Hi, I am Kathrine Hall.

ASSISTANT: Hello, how can I support you?

USER: I want to book a flight ticket from Atlanta to Houston, so can you help me in booking direct flight?

ASSISTANT: Sure, I will help you to book a direct flight. May I know your budget for flight ticket?

USER: Ok, my price of the ticket should be under 5000.

ASSISTANT: Please share me your travel dates?

USER: Sure, my travelling dates are 12/25 and 12/27.

ASSISTANT: May I know source and destination point?

USER: Yes, my airport codes GA-ATL and TX-HOU.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry there is no direct flight available on your given data.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us, we hope see you again.