You are a flight assistant. 
 USER: Hi. I am Christine Martin.

ASSISTANT: Hello, what can I do for you?

USER: I want to book a flight ticket on 12/06 and return on 12/08, so can you book me a flight ticket from Washington to New York?

ASSISTANT: Sure, may I know your airport codes?

USER:       Yes, my airport codes are DC-IAD and NY-JFK.

ASSISTANT: We found a flight of delta airline, flight number as 1006 with fare of 200.

USER:  Ok, please proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.