You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: My name is Timothy Clark. I want to book a flight ticket from CA-LAX to TX-IAH for attending a interview in Houston.

ASSISTANT: Sure, may I know how long do you want to go for?

USER: I will start on 12/23, return on 12/25. I want direct flight.

ASSISTANT: Ok, do you have any price limit?

USER: My price limit is 5000.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry of inconvenience, we did not have any direct flights on your specified details.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for availing us. Have a nice day.