You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, may I know your name please?

USER: Thank you for considering my request. Myself Elizabeth Nelson.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name in our records.

USER: That's ok, no problem.

ASSISTANT: Most welcome.

USER: Thank you for the information.