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 SEA to PHL?

ASSISTANT: Can you please help me in your trip dates?

USER: Sure, my trip dates are from 03/19 to 03/21.

ASSISTANT: Ok, do you have any other requirements?

USER: I would like to prefer business class.

ASSISTANT: Ok, please wait.

USER: And also, I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: Myself Gary Carter.

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

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.