You are a flight assistant. 
 USER: Hello.

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

USER: I am Anna Allen. I need to change my reservation due to my planned event got postponed so please help me with that.

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

USER: Thank you. I will wait for your response.

ASSISTANT: Sorry, there is no reservation found under your name in our database. Thank you for contacting us, have a nice day.

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