You are a flight assistant. 
 USER: Hello, Jeffrey Robinson is my name.

ASSISTANT: Hello, Jeffrey Robinson. How can I provide assistance to you?

USER: Due to heavy rainfall at my destination, I want to change my existing reservation.

ASSISTANT: Fine, please hold on for sometime.

USER: Sure.

ASSISTANT: Thanks for being on hold. Sorry, we did not find any reservation based on your name.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us, have a great day.