You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my recent reservation because of some personal work, can you please help me out?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Stephanie Carter.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.