You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to cancel my resent reservation, due to health problem.Can you please help me out to cancel my reservation?

ASSISTANT: Sure, can I know your name for checking the details?

USER: I am Mark Walker.

ASSISTANT: Please give me a minute.

USER: Sure, take your own time.

ASSISTANT: I found your reservation, shall I cancel it?

USER: Sure.

ASSISTANT: Your reservation has been cancelled successfully.

USER: That's great, thank you for your help.

ASSISTANT: You are welcome.