You are a flight assistant. 
 USER: Hello, I am Eric Nelson.

ASSISTANT: Hello, how may I aid you today?

USER: I need to fly from OAK to IAD, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: Sure, my journey dates are Dec 27 and Dec 29.

ASSISTANT: Do you have any restrictions to be met?

USER: I need a halt.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We have found a direct flight of Delta airlines, flight number-1005 and fare is 100. Shall I proceed with the booking?

USER: Go ahead.

ASSISTANT: Sure,  your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Thank you for opting us.