You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to attend my cousin marriage for that I reserved the ticket, but right now I want to cancel that reservation. Can you help me with this?

ASSISTANT: That's fine. Can I know your name please?

USER: I am Robert Gonzalez.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry Robert, I did not find any reservation regarding your details.

USER: That's fine. Thanks for your valuable information.

ASSISTANT: You are welcome.