You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Myself Richard Robinson here. I want to cancel my recently done reservation, because of postpone of my exam. Can you please help me?

ASSISTANT: Ok Robinson. Sure. Sorry Richard, no reservations with your name.

USER: No problem. Thank you for your service.

ASSISTANT: It's my pleasure Richard. Have a good day.