You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you?

USER: Unfortunately multi-car 50 mile canyon road test drive was postponed at Denver so I need to change my reservation. Can you please help me to change my reservation?

ASSISTANT: We are here to serve you. To proceed with changing your reservation, I need to know your name?

USER: Sure, my name is Shirley Carter.

ASSISTANT: Please wait for some time, I will check the reservation list and revert to you.

USER: Ok, I will wait.

ASSISTANT: Thank you for your precious time. Unfortunately there is no reservation found on Shirley carter name.

USER: That's not a problem. Thanks for your service.

ASSISTANT: Thank you for availing with us.