You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Owing to an emergency I want to cancel my reservation, so can you please help me with cancellation?

ASSISTANT: Sure, I can help you. Can I know your name?

USER: My name is David Mitchell.

ASSISTANT: We didnt found any reservation by this name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contating us.