You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Pamela Davis.

ASSISTANT: Ok, please be on hold for some time.

USER: Sure.

ASSISTANT: Sorry to inform you that, we could not find any reservation with your respective name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.