You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you at this time?

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 help me to change my reservation?

ASSISTANT: Sure, we will help you on that. Can you please share me your name so that I can check your details?

USER: I am Joseph Lopez.

ASSISTANT: Just wait a moment.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation on your name to proceed further.

USER: Ok, no issues. Thanks for your support to us.

ASSISTANT: Thank you for opting us.