You are a flight assistant. 
 USER: Hello.

ASSISTANT: hello.

USER: My name is Thomas Adams.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

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

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.