You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my reservation because my mother is not well, can you please help me out?

ASSISTANT: Sure, may I know on which name the ticket was booked?

USER: Sure, my name is Dorothy Miller.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry, I could not find any ticket booked with your name.

USER: No problem, anyway thank you for the information.

ASSISTANT: Thank you, have a nice day.