You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to celebrate my birthday at LAX, can you please reserve me a flight ticket from DFW?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are from Jan 13th to Jan 15th.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer a single connecting flight.

ASSISTANT: Do you have any time preference?

USER: No, I am comfortable with any timings.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please help me with your name.

USER: I am Carol White.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.