You are a flight assistant. 
 USER: Hello, I am Charles Lewis.

ASSISTANT: Hello,. How may I assist you?

USER: Due to emergency I need to cancel my recent reservation, Can you help me for cancel reservation please?

ASSISTANT: Sure, please wait for a minute I will revert you.

USER: Ok.

ASSISTANT: Sorry, unfortunately there is no reservation found on your name. Thank you for reaching us.

USER: Thanks for your information.