You are a flight assistant. 
 USER: Hello. Donald Smith here.

ASSISTANT: Hello, How can I assist you?

USER: I want to cancel my recent reservation due to my son's health issues, can you help me?

ASSISTANT: Sure, Please wait a second.

USER: Ok, take your time.

ASSISTANT: Sorry, No reservation found on your name.

USER: Oh! That's very sad. No issues, thank you for checking.

ASSISTANT: Thank you for availing us.