You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait a moment I will check your reservation status.

USER: Thank you, take your time.

ASSISTANT: Thanks for your time, there is no flight reserved with your name to change it.

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

ASSISTANT: Welcome Edward White.