You are a flight assistant. 
 USER: Hello, myself John Green.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book me a flight ticket from IAD to DEN?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, my trip dates are 12/25 and 12/27.

ASSISTANT: Ok, please wait. Thank you for waiting, I have searched a flight ticket with 1021 flight number and 100 as fare.

USER: Ok, please confirm my reservation.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you so much.

ASSISTANT: Thank you for reaching us.