You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, please share your good name.

USER: Myself Larry Phillips.

ASSISTANT: Please stand by.

USER: Ok.

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

USER: Not an issue. Thank you.

ASSISTANT: Thank you.