You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking my ticket from JFK to OAK?

ASSISTANT: Can you please share your trip dates?

USER: Sure, my trip dates are from 09/13 to 09/15.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: Myself Samantha Johnson.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.