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

ASSISTANT: Hello, How can I serve you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry Michael Williams, there is no active reservation on your name.

USER: Ok, I will make another way to reach my destination. Thank you for sharing the information.

ASSISTANT: Thanks for approaching us, hope to serve you again.