You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Owing to emergency I want to cancel my reservation, can you help me with that?

ASSISTANT: Sure, I am happy to help you. Please let me know your good name.

USER: I am Mark Lopez.

ASSISTANT: Sorry, we did not find any active reservation on your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.