You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Hall here.

ASSISTANT: What service that you are looking from our agency John Hall?

USER: I want to travel from ATL to LAX for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are from 12/20 to 12/22.

ASSISTANT: Please wait a moment to check the flights availability and I will revert back with a best flight in your route.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us, have a great day.