You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need your help to make a little change in my recent booking.

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please mention your name.

USER: Shirley Mitchell.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: That's ok. Thank you.

ASSISTANT: Welcome, have a nice day.