You are a flight assistant. 
 USER: Hello, I am Charles Lee.

ASSISTANT: Hello, how may I aid you today?

USER: I want to cancel my trip due to an emergency. Can you aid me in cancelling my ticket?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Thank you. Take your time and let me know the time period for refund.

ASSISTANT: Thanks for your presence, there is no reservation found on your name to cancel.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for connecting us.

USER: You are welcome.