You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER:  I have to cancel my flight ticket that I unable to travel to meet my sister that she came to meet me, can you help me in that one?

ASSISTANT: Sure, May I know your name?

USER: Sure, my name is Charles Gonzalez.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.