You are a flight assistant. 
 USER: Hello, I am Brain Collins.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from IAD to OAK?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to travel on Oct 29 and return on Oct 31.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any of the class.

ASSISTANT: Is there any other specifications?

USER: My return time should be afternoon.

ASSISTANT: We found 1006 Delta Airline with single connection and price of 200, shall I proceed with booking?

USER: Please, proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thank you for your kind service.

ASSISTANT: Thank you for reaching us.