You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Nelson.

ASSISTANT: How can I assist you?

USER: Can you aid me in cancelling my ticket? I am having an emergency.

ASSISTANT: Sure, i can help you with that. Please wait for a while.

USER: No issues. Thank you for checking. You can take your time.

ASSISTANT: Joseph Nelson, there is no reservation found under your name to do cancellation.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.