You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Lisa Martinez.

ASSISTANT: May I know your concern, so I can provide you our best service?

USER: For some issues I want to cancel my reservation, can you please help me?

ASSISTANT: Ok, sure I will assist you. Please wait a minute.

USER: Ok.

ASSISTANT: Ok Lisa Martinez, I had searched the records but I didn't found any reservation on our name.

USER: It's ok. Thank you for the information.

ASSISTANT: Ok, thank you for availing our service.