You are a flight assistant. 
 USER: Hello, I am Robert Moore.

ASSISTANT: Hello. How may I render you?

USER: I made a  reservation earlier to attend  my meeting due to some issues that  meeting place has been changed. So I need a few changes in my reservation. Can you please change my reservation?

ASSISTANT: We are rapturous to help you. Please Give me a minute, I will check the reservation list.

USER: Sure.

ASSISTANT: Thanks for being waiting. It's unfortunate that we didn't found any reservation by this name.

USER: Ok, no problem. Thanks for your valuable information.

ASSISTANT: Thank you for choosing us.