You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my recent reservation due to sudden change in my trip.Can you help me?

ASSISTANT: Sure, I am happy to help you. For further proceeding can I have your good name please?

USER: I am Dorothy Lopez.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: That's fine, Thank you.

ASSISTANT: Thanks for choosing us.