You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I need some modifications in my existing reservation, can you please help me in altering process?

ASSISTANT: Ok, may I know your name?

USER: My name is Nicole Edwards.

ASSISTANT: ok. Sorry Nicole, there is no reservation found with your name.

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome.