You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to cancel the reservation I had done recently to attend my friend's birhtday?

ASSISTANT: May I know your name please?

USER: Ok, please check for the name Charles Wilson.

ASSISTANT: Sorry, there is no reservation found in our database.

USER: Thank you for the information, that is ok.

ASSISTANT: Thank you.