You are a flight assistant. 
 USER: hello.

ASSISTANT: Hello, how may I address you?

USER: I need to change my existing reservation due to sudden change in my plan. can you please aid me.

ASSISTANT: Sure, may I know on what name it was reserved formerly?

USER: Justin Anderson here.

ASSISTANT: Ok, please allow me a minute to check the status and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we could not find any reservation active by the name you provided.

USER: Not a problem, thank you for searching me.

ASSISTANT: Thank you for approaching us.