You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, my name is Timothy Williams.

ASSISTANT: Please give me a moment to check your previous reservation.

USER: Sure, I will wait.

ASSISTANT: Sorry, no reservation found on your name to cancel your reservation.

USER: Ok, not an issue. Thank you for your service.

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