You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Andrew Thompson.

ASSISTANT: How can I serve you?

USER: I want to celebrate my birthday at San Francisco, CA-SFO, can you please reserve me a ticket from Las Vegas, NV-LAS?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travelling dates are from 12/06 to 12/08.

ASSISTANT: Do you need any stop over?

USER: Yes, I need a stopover.

ASSISTANT: We found a  a direct flight at this moment.

USER: Do not proceed for booking.

ASSISTANT:  Ok, Thank you for reaching us.

USER: Thank you for your information.