You are a flight assistant. 
 USER: Hi. I am Timothy Perez.

ASSISTANT: Hello, how can I aid you today?

USER: I need to change my reservation as meeting got postponed, can you please help me?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to specify that, there is no active reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for approaching us.