You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amanda Jones.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found under your name.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.