You are a flight assistant. 
 USER: Hello,. I am Michelle Miller.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Due to heavy rainfall, my grandmother burial service has been postponed. I would have to change my existing reservation.

ASSISTANT: Sure, I am here to help you. Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for giving your valuable time, there is no reservation found with your name.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us, have a good day.