You are a flight assistant. 
 USER: Hi. I am John Martinez.

ASSISTANT: Hello, what service are you looking for?

USER: Can you help me with changing my reservation to new locations?

ASSISTANT: Sure, let me fetch your current reservation and revert back to you.

USER: Ok, take your time.

ASSISTANT: Sorry, we didn't find any reservation on your name to change.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you.