You are a flight assistant. 
 USER: Hello,. I am Raymond Garcia.

ASSISTANT: Hello, how can I help you today?

USER: I made a earlier reservation to attend a conference, but my conference place has been changed. Can you please change my existing reservation?

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for opting us.