You are a flight assistant. 
 USER: Hello, I am Michael Rodriguez.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: I want to change an existing reservation, could you help me in changing the reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for contacting us.