You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to cancel the reservation I had done recently?

ASSISTANT: May I know your name please to proceed further?

USER: Ok, please check for the name Sandra Perez.

ASSISTANT: No reservation found on our database.

USER: Ok, that is not problem. Thank you for assisting me.

ASSISTANT: Thank you for choosing us.