You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Sandra Edwards. Can you please help me in changing my existing reservation, as my football match got postponed to some other date.

ASSISTANT: Sure, I am here to help you with that reservation change.

USER: Thank you.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure, take your time.

ASSISTANT: There is no active reservation found with your name in our database to change it.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us, have a great day.