You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you today?

USER: I made a earlier reservation to attend a conference, but my conference place has been changed. Can you help me to change the reservation?

ASSISTANT: Sure, please wait for a while. May I know your name please?

USER: Alexander White here.

ASSISTANT: Ok, thanks for your time. Sorry, no reservation was found based on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for visiting us.