You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dennis Lee. Can you help me for cancelling my recent reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found under your name.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: You are welcome.