You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick Miller here.

ASSISTANT: How may I assist you?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Please wait a moment, I will check the status of your reservation.

USER: Ok, I will wait.

ASSISTANT: Patrick Miller, no reservation has been found on your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.