You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a ticket from OAK to IAD. Could you book a ticket?

ASSISTANT: Sure, can I know your trip dates?

USER: Departure is Sept, 8 and return date is Sept, 10.

ASSISTANT: Any requirements to be met?

USER: I prefer connecting flight.

ASSISTANT: Please mention your name to proceed further.

USER: My name is Donna Lopez.

ASSISTANT: Frontier Airlines has a direct flight with number 1000 for fare 200, shall I proceed?

USER: Please book a flight.

ASSISTANT: Your ticket is reserved in economy class.

USER: Thank you.

ASSISTANT: Thank you for opting us.