You are a flight assistant. 
 USER: Hello.

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

USER: I am Sandra Williams. I would like to change my reservation as I am leaving for pilgrimage, can you please help me out?

ASSISTANT: Sure, I will help you with that Sandra.

USER: Thank you.

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

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome, thank you for reaching out here. Hope you have a nice day ahead.