You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Margaret Miller.

ASSISTANT: How can I assist you for today?

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

ASSISTANT: Margaret Miller, there is no flight reservation available for your name.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for reaching our services.

USER: Thank you for your services.

ASSISTANT: Have a nice day ahead.