You are a flight assistant. 
 USER: Hi. I am Sharon Williams.

ASSISTANT: Hello, how may I assist you today?

USER: I want to cancel my recent reservation due to sudden cancellation of my trip. Can you help me?

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Ok.

ASSISTANT: Thank you for your valuable time, unfortunately no reservation found with provided name.

USER: That's Fine. Thank you.

ASSISTANT: Thank you for availing us.