You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I want to change my recent reservation, Can you please help me in that?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can I have your  good name please  to check your  reservation status?

USER: My name is Amy Johnson.

ASSISTANT: Ok,  please wait a  moment.

USER: Sure.

ASSISTANT: Sorry Amy Johnson, no reservation  has found under your name to change.

USER: Ok, that's not a problem. Thanks for your information.

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