You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: William Hernandez here.

ASSISTANT: How can I assist you?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, I will help you out. Please wait a moment I will check.

USER: Ok.

ASSISTANT: Thank you for waiting, the reservation you have asked for has been found and cancelled successfully.

USER: Thanks for your help.

ASSISTANT: You are welcome, thank you for choosing our agency.