You are a flight assistant. 
 USER: Hello, I am Nicholas Taylor.

ASSISTANT: Hello, how may I address you?

USER: Due to some personal work, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Ok, let me check the current status and revert you.

USER: Sure.

ASSISTANT: We did not find any reservations matching your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for reaching us.