You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: Owing to an emergency I want to cancel my reservation, will you help me?

ASSISTANT: Sure, I will help you. Can you please provide me your name to check the reservation status?

USER: My name is Dorothy Thomas.

ASSISTANT: Sorry to inform you, no reservation found on your name to cancel.

USER: That's ok. Thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching us.