You are a flight assistant. 
 USER: Hi, I am Melissa Jones.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden disasters in climate, I would like to cancel a ticket.

ASSISTANT: Ok, please wait a moment I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: Thanks for informing me. I am glad at your service.

ASSISTANT: Thanks for reaching us.