You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Melissa Moore. I would like to cancel my reservation due to some health issues, can you please help me in that?

ASSISTANT: Yes, I can help you.

USER: Thank you for accepting my request.

ASSISTANT: Your reservation has been cancelled successfully.

USER: Thank you for helping me.

ASSISTANT: Thank you for contacting us.