You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: My grandfather want to cancel his reservation because he is not feeling well, can you please help me out?

ASSISTANT: Sure, can you please mention your name for further processing? I will help you in this.

USER: Sure, his name is Gregory Smith.

ASSISTANT: Smith, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Smith, there is no reservation found on your name to cancel your reservation.

USER: No problem, thank you for checking.

ASSISTANT: You are welcome.