You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Robert Brown. Due to some health issues, I would like to cancel my journey. Can you please cancel my reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flights available.

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome.