You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Donald Hill. Due to some problems my trip was cancelled so can you please cancel my flight ticket?

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

USER: Thank you for your response.

ASSISTANT: Please give me a moment.

USER: Ok.

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

USER: Oh! It's ok no problem. Thank you for your information.

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