You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Lee.

ASSISTANT: How can I help you now?

USER: Can you help me for cancelling my recent reservation, because I am unable to travel at this moment due to health issues?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry Gregory, there is no reservation found on your name.

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

ASSISTANT: Thank you for approaching us, have a nice day.