You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a ticket from OAK to SEA, can you help me?

ASSISTANT: Sure, please share me your trip dates.

USER: My travel dates are Sept 27 and 29.

ASSISTANT: Is there any time concern for you?

USER: No.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Lisa Davis.

ASSISTANT: May I know your class preferences?

USER: I am comfortable with any class.

ASSISTANT: We found a Frontier airline and 1013 is flight number with a fare of 200. Shall I proceed?

USER: Yes, please.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you for booking.

ASSISTANT: Thank you for opting us.