You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Donald Miller. Can you help me in booking a flight ticket from MCO to SFO?

ASSISTANT: Sure, can you please share your travel dates?

USER: Sure, my travelling dates are Sept 15 and Sept 17.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: May I know your connection limit?

USER: I require a single connecting flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: My return time should be in the morning.

ASSISTANT: Donald Miller, I am sorry to inform you that there is no flight available at you request.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for contacting us.