You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I have booked a ticket recently on my name Melissa Gonzalez and due to health issues I have to cancel my ticket, can you help me?

ASSISTANT: Sure, I will help you about that.

USER: Thank you.

ASSISTANT: Sorry Melissa, there is no existing reservations under your name to cancel.

USER: Ok, that's fine. I think it might be cancelled by some one in my family, thank you for your information.

ASSISTANT: My pleasure, thank you for reaching out here.

USER: Welcome.