You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me in booking my flight ticket from SFO to LAS?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travelling dates are Mar 25 and Mar 27.

ASSISTANT: Do you have any other requirements?

USER: I need connecting flight.

ASSISTANT: May I know your name?

USER: Myself Kevin Williams.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Thanks for your information.

ASSISTANT: Thank you.