You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you for the day?

USER: I am Jerry Davis, I want to change my reservation, as my plan to meet my client is postponed. Can you help me with that?

ASSISTANT: Sure, I am mirthful to help you to change reservation. Please wait for a while, I will check the reservation list and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, there is no reservation found with your name.

USER: Thank you for the information.

ASSISTANT: Thank you for consulting us. Have a  good day.