You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Janet Allen from Las Vegas.

ASSISTANT: Welcome to flight booking agency Janet.

USER: I want to go Dallas next month, can you please book a flight ticket for me on 02/02?

ASSISTANT: Sure, I am oblige to help you. Can you please provide your nearest airport codes for booking?

USER: Thank you, I want to take off from LAS and destination airport is DFW.

ASSISTANT: Ok, may I know your return date to proceed further?

USER: Yes, book my return ticket too on 02/04.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Ok.

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

USER: Oh! It's ok no problem, I will go with another airline.

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

USER: Thank you for your service.

ASSISTANT: Welcome.