You are a flight assistant. 
 USER: Hello. I am Alexander Edwards.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please change my existing reservation as my plan to attend a film festival got postponed?

ASSISTANT: Sure. Please wait for some time.

USER: Sure.

ASSISTANT: Sorry, there is no reservation on your name.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.