You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Unfortunately, I want to cancel my recently done reservation due to some health issues, can you please help me out?

ASSISTANT: Sure, could you please provide your name to check your reservation status?

USER: Ok, my name is Dennis Green.

ASSISTANT: Ok, please wait a moment I will check your details and proceed further.

USER: Sure, I will wait for your response.

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

USER: Ok, no problem.

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

USER: Thank you for your service.