You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My friend met with an accident, so he said me to cancel his reservation. Can you please help me to cancel his reservation?

ASSISTANT: Sure, can I know the name on which the ticket has been reserved please?

USER: Sure, his name is Dennis Collins.

ASSISTANT: Sorry, there is no reservation found on his name.

USER: No problem, thank you for checking.

ASSISTANT: It's our duty, thank you for approaching us.