You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: May I know your name?

USER: Sure, myself Samantha Lee.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure, take your time to check.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Oh! It may not be booked properly while booking due to server issue. Anyway, thank you for your time.

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