You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in booking a flight ticket to SFO from MCO in month of May?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my trip dates are May 20 and May 22.

ASSISTANT: May I know your name?

USER: Sure, my name is Shirley Carter.

ASSISTANT: Sorry Shirley Carter, we regret to inform you that but there is no flight available on these dates.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Most welcome.