You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Williams Thomas. Can you help me to cancel my reservation? Because I have some work on that dates.

ASSISTANT: Yes, I can help you with that. Sorry to inform you that there is no reservation found on your name.

USER: That is fine. Thank you for your help.

ASSISTANT: Thank you for reaching us.