You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am George Lee from Atlanta.

ASSISTANT: Nice meeting you George.

USER: Thanks, nice to meet you too. I want to go to Dallas next month for attending a business meeting there, can you please book a flight ticket from ATL to DFW?

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

USER: I want to take off on 07/21 and please confirm my return ticket also on 07/23.

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

USER: Ok.

ASSISTANT: We regret 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. Thank you for your service.

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