You are a flight assistant. 
 USER: Hello, I am Anna Scott.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: I could not find any reservation with your name in our database.

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

ASSISTANT: Thanks for choosing us, have a great day ahead.