You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Raymond Lee.

ASSISTANT: Ok.

USER: To Locate, Enjoy and Find Best Hotels, I want to visit San Francisco, CA - SFO. Can you help me in booking a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my trip dates are from 12/31 to 01/02.

ASSISTANT: Please share your source airport.

USER: Sure, my source is Denver, CO - DEN.

ASSISTANT: Do you want connecting flight?

USER: No, I need a direct flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for choosing us.