You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Suddenly, my friends change the destination location. Can you please change my recent reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is John Martinez.

ASSISTANT: Sorry John, unfortunately there is no reservation found under your name in our database.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.