You are a flight assistant. 
 USER: Hello. I am Amy Moore.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, I am glad to help you.

USER: Thanks for accepting my request.

ASSISTANT: Please be on hold.

USER: Sure, I will wait for your response.

ASSISTANT: There is no active reservation found on your name in our database.

USER: Ok, that's not a big problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.