You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to modify my previous flight ticket booking that I have booked the ticket with wrong dates, can you please help me with that one?

ASSISTANT: Sure, before proceeding further may I know your name please?

USER: Thank you for considering my request and my name is Gregory Johnson.

ASSISTANT: Ok, based on your name we haven't found any previous reservation in airline database.

USER: Ok, that's fine. Thank you for checking my reservation status with in quick time.

ASSISTANT: Thanks for contacting us.

USER: Welcome.