You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, please share your good name?

USER: I am Jonathan Hill.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: It's ok, thank you.

ASSISTANT: Thank you.