You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is David Garcia, can you help me to cancel the reservation?

ASSISTANT: Sure, I am gleeful to help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Yes, please take the time you need to cancel.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database to cancel your reservation.

USER: That's ok, thank you for assisting me.

ASSISTANT: Thank you for opting us, have a nice day.