You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: John Williams here. I want to cancel my reservation because I was having interview, but I am not fully prepared, can you please help me?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your details.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation found on your name in my database.

USER: That's ok, thank you for your help.

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