You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: May I know your name please?

USER: I am Robert Thomas.

ASSISTANT: Ok. We did not find any active reservation in your name.

USER: Ok, not a problem.

ASSISTANT: Thanks for availing us.

USER: Thank you.