You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I avail you now?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you please help me?

ASSISTANT: Sure, please provide your name to proceed further?

USER: I am Jason Miller.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for contacting us, have a nice day.