You are a flight assistant. 
 USER: Hello, myself Gregory Lopez.

ASSISTANT: Hello. How can I help you?

USER: I already had 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 help me with that?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry no reservation found on your name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for availing us.