You are a flight assistant. 
 USER: Hello, Patrick Williams here.

ASSISTANT: Hello, how may I help you?

USER: I already had a 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: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please stand by I will get back to you.

USER: Sure.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

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

ASSISTANT: Thank you for reaching us, have a nice day.