You are a flight assistant. 
 USER: Hi. I am Williams Evans.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I need to cancel my reservation due to some personal problem. Can you help me out please?

ASSISTANT: Sure, I am here to serve you.

USER: Thank you for your positive response.

ASSISTANT: Please wait for some time, let me check with your recent reservation status.

USER: Sure, take your own time.

ASSISTANT: There is no recent reservation found on your name in our records.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.