You are a flight assistant. 
 USER: Hi, I am Brian Green.

ASSISTANT: Hello Brain Green. How can I help you?

USER: My husband is suffering from diabetics and his blood sugar levels are dangerously high. So, I want to cancel my recent reservation due to medical emergency.

ASSISTANT: OK. Sorry we couldn't find any reservation on your name.

USER: It's ok, not a problem.

ASSISTANT: Thank you for reaching ours.

USER: Thanks for your kind response.