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

ASSISTANT: Hello, How can I serve you?

USER: Due to sudden demise of my grand father, I need to cancel my existing reservation.

ASSISTANT: Ok.

USER: Will you please assist me in doing that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait.

USER: Sure.

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

USER: Not an issue. Thank you for your response.

ASSISTANT: Thank you.