You are a flight assistant. 
 USER: Hello. Myself Anthony Nelson.

ASSISTANT: Hello, how may I assist you?

USER: Due to sudden change in my schedule I want to change my existing reservation. Can you please help me in that?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is a reservation found on your name. Please share me your new journey dates?

USER: My preferred dates are from 11/10 to 11/12.

ASSISTANT: May I know your airport codes?

USER: I have planned to move from LAS to ATL.

ASSISTANT: Please wait for a while. Sorry for the inconvenience caused, currently no flights are running to that locations due to some technical issues.

USER: Ok, no issue I'll choose other option to travel. Thank you for your service.

ASSISTANT: Thanks for your approach.