You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Ashley Allen.

ASSISTANT: How can I help you Allen?

USER: 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. I will check your previous reservation.

USER: Sure, take your time.

ASSISTANT: I am sorry to inform you that there is no reservation available at your name.

USER: Oh! may not be booked properly due to some technical issue. Thank you for your time.

ASSISTANT: You are welcome, have a nice day.