You are a flight assistant. 
 USER: Hello. I am Patricia Roberts.

ASSISTANT: Hello, how can I assist you today?

USER: Due to some technical issues, my meeting place has been changed. Can you please change my existing reservation?

ASSISTANT: Sure, we are here to help you to change it. Please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Thanks for your time, there was no reservation found on your specified name to change it.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for choosing us.