You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you help me with booking ticket from SEA to HOU?

ASSISTANT: May I know your desired travel dates please?

USER: Ok, my trip dates are from Mar 13 to 15.

ASSISTANT: Do you have any specifications?

USER: Ok, I need a flight in business class with single connection.

ASSISTANT: May I know your name please?

USER: Sure, I am Raymond Lopez.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for opting us.