You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I have booked a ticket for my mother last month. As she is not feeling well, can you help me to change the reservation?

ASSISTANT: Sure, on whose name you have reserved your previous booking?

USER: Brandon Nelson is the name on which the reservation is done.

ASSISTANT: Sorry to inform you that no reservation found based on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have  a nice day.