You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joseph Nelson.

ASSISTANT: How may I assist you, Nelson?

USER: I am unable to travel at this moment due to health issues, so can you help me for cancelling my recent reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Nelson, there is no active reservation has been found on your name.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for choosing us.