You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Myself Jacob Jackson. I need to change my reservation due to my planned event got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Jacob Jackson, there is no active reservation found under your name in our database.

USER: Oh! It may not be booked properly while booking.

ASSISTANT: Thank you for contacting us.

USER: Anyway, thank you for your time.