You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help that I can do for you?

USER: I am Stephanie King. I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, please give me a moment to check you previous booking.

USER: Ok.

ASSISTANT: Thank you for your patience, I have checked your reservation and it shows that there is no reservation for the user name.

USER: Not an issue. Thank you.

ASSISTANT: You are most welcome and thank you for consulting our agency for your help.