You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to cancel my reservation, due to some health problems I am unable to travel those dates so can you please cancel my reservation?

ASSISTANT: Sure, I will help you on that. Will you mention your name for checking the reservation?

USER: Thanks, my name is Ronald Mitchell.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Oh! May be my brother might be cancelled my ticket, I will ask him later. Thank you for your service.

ASSISTANT: Welcome, have a great day.