You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Sarah Adams. Can you help me booking a flight ticket from LAS to OAK?

ASSISTANT: Sure, I am here to help you. When did you scheduled to fly?

USER: I will start on Dec, 11 and return on Dec, 13.

ASSISTANT: Is there any class preference for you?

USER: I am comfortable with any class.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I am comfortable with any flight.

ASSISTANT: We found a direct flight with fare of 100 and 1001 flight number. Shall I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your seat has been reserved with Delta airline in economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.