You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: Due to some issues, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Ok, may I know your name to check with your booking status?

USER: I am Katherine Rodriguez.

ASSISTANT: Katherine Rodriguez, please wait for a moment.

USER: Sure.

ASSISTANT: I am very apologetic to inform you this news, but there is no active reservation found by your name in our agency database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching our agency services.