You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please assist me with my flight ticket cancellation that I am unable to travel the trip on those planned dates?

ASSISTANT: Sure, can I know your name?

USER: Thank you for your positive response and my name is Sandra Perez.

ASSISTANT: Please hold on a moment.

USER: Sure, I can wait.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: No problem with that one. I think my brother might be cancelled the ticket. Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.