You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation, can you please aid me in changing?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Andrew Phillips.

ASSISTANT: Please give me a minute to check your reservation status.

USER: Sure.

ASSISTANT: Andrew Phillips, there is no active reservation found under your name to do modifications in that.

USER: Ok, no issues at all. Thank you.

ASSISTANT: Thank you for reaching us.