You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is William Anderson.

ASSISTANT: What assistance do you need from our travel agency?

USER: Could you do me a favour in cancelling my recent reservation?

ASSISTANT: Sure, I will help you. Please let me check the reservation.

USER: Ok, take your time.

ASSISTANT: Ok, thank you for waiting. Sorry to inform you, I didn't found any reservation with your name to cancel.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.