You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Myself Lisa Collins. I want to change my existing reservation, can you help me?

ASSISTANT: Sure, I am gleeful to help you out. Please allow me a moment to check any active reservation is found on your name or not.

USER: Thank you for the quick response.

ASSISTANT: Sure.

USER: Surely, I will wait for your response.

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

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.