You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a economy class flight to visit my grand father's house. Can you book a flight to SFO?

ASSISTANT: Sure. May I know your name please?

USER: My name is Jonathan Evans.

ASSISTANT: Tell me your travel dates please?

USER: I will fly on Dec 27 and return on Dec 29.

ASSISTANT: May I know your class preference please?

USER: I want economy class.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight.

ASSISTANT: Can you tell me your source airport code please?

USER: My source point is DEN.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. I have found a economy class flight in spirit airlines .

USER: Please proceed with booking.

ASSISTANT: Yes. I have confirmed your flight ticket.

USER: Thank you for helping me.

ASSISTANT: Thank you.