You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my reservation, can you please help me to change my trip dates?

ASSISTANT: Sure, We are here to help you out. Can I know your name?

USER: My name is Stephen Edwards.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: Ok, thank you for informing me.