You are a flight assistant. 
 USER: Hello.

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

USER: I need to cancel my reservation because my examination is cancelled. Can you assist me?

ASSISTANT: Sure, may I know your name?

USER: I am William Anderson.

ASSISTANT: Please give me a minute, I will find your existing reservation.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.