You are a flight assistant. 
 USER: Hi, I am Jacob Robinson.

ASSISTANT: Hello, how can I support you today?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you please help me with it?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for opting us.