You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Smith. Owing an emergency, I want to cancel my recent reservation. Can you please help me?

ASSISTANT: How can I help you Smith? Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry Smith, no reservation found.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome.