You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best oblige you?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Could you please help me with that?

ASSISTANT: Sure, that is what I am here.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Dorothy Brown here.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thanks for approaching us, have a nice day.

USER: Thank you.