You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I am Gary Edwards from Las Vegas.

ASSISTANT: Nice meeting you Gary.

USER: Thanks, nice to meet you too. I want to go Washington next month, can you help me in booking flight ticket?

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

USER: Thank you.

ASSISTANT: Ok, may I know your preferable journey airport code locations?

USER: I want to take off on 02/28 and book my return ticket also on 03/01. I want to fly from LAS and destination airport is DCA.

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 service.

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

USER: Thank you for your service.

ASSISTANT: Most welcome.