You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Please check is there any flight between SFO and DFW to attend a meeting.

ASSISTANT: Sure, may I know your good name?

USER: Sure, my name is William Perez.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any more specifications?

USER: I would like to return in evening time.

ASSISTANT: Could you please provide your depart and arrival dates?

USER: My boarding is on Dec 28 and please book my return ticket on Dec 30.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a connecting flight 1019 from Southwest airline has fare 200 and arrival time is 2:00 AM.

USER: I am ok with this flight, you can proceed with booking.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.