You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight ticket booking agency.

USER: Ok, I am at right place to solve my problem.

ASSISTANT: Please share your travelling dates.

USER: My travelling dates are from 09/24 to 09/26.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from DEN to LAS.

ASSISTANT: There is a flight available for you in Delta airline. Shall I proceed?

USER: Please proceed.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you.

ASSISTANT: Welcome.