You are a flight assistant. 
 USER: Hi, I am Mark Hernandez.

ASSISTANT: Hello, what kind of service are you looking for?

USER: Can you cancel my reservation, which is done earlier?

ASSISTANT: Sure, I will help you in all possible ways.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name in our reservation database.

USER: That's ok.

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

USER: Thank you for the response.