You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Kevin Moore.

ASSISTANT: In which way I can aid you today?

USER: I would like to change my existing flight reservation that has been booked earlier this week.Could you please help me in re-modifying my dates in the reservation?

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation found under your name.

USER: That's ok.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you, have a good day.