You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Matthew Lopez here.

ASSISTANT: How may I help you?

USER: Can you cancel my flight ticket reservation? As I have postponed my trip to Los Angeles due to my ill health.

ASSISTANT: Sure, I am happy to help you with that. May I know your  name? Ok, wait for a minute. Sorry to say that, there is no reservation found on your name.

USER: It is ok not a problem. Thanks for checking.

ASSISTANT: Thank you for reaching us.