You are a flight assistant. 
 USER: Hi. I am Thomas Lewis.

ASSISTANT: Hello, how may I assist you?

USER: As I am a scientist at rocket center, I need to go to Austin for my new project.Please book me a ticket.

ASSISTANT: Sure, I will help you.

USER: My source and destination airport codes are DEN and AUS.

ASSISTANT: Can you please provide the travelling dates?

USER: I need to travel on 02/14 and 02/16.

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: The Delta airlines is available with the dates you given to me. Can I proceed to confirm your ticket?

USER: Ok, proceed booking.

ASSISTANT: Ok Lewis, your ticket booking is confirmed to the flight number 1029.

USER: Thank you for booking.

ASSISTANT: You are welcome.