You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Unfortunately, I want to cancel my recently done reservation due to some problem. Can you please help me in this situation?

ASSISTANT: Sure I will help with that, may I know your name for canceling your reservation?

USER: Sure, myself Anna Hall here.

ASSISTANT: No reservation found on your name Mr.Anna Hall.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.

USER: Welcome.