You are a flight assistant. 
 USER: Hello. Myself Nicholas Walker.

ASSISTANT: Hello, how may I aid you for today?

USER: I would like to change my flight reservation, can you please help me?

ASSISTANT: Sure, I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: Sorry to say this Walker, there are no active reservations under your name to change.

USER: Not an issue, thank you for the information.

ASSISTANT: You are welcome, thank you for reaching out here.