You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to cancel my ticket due to sudden change in my college trip.

ASSISTANT: Sure, we are here to help you. Can I have your name to proceed further?

USER: Donna Barker here.

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

USER: Not an issue, thank you for helping me.

ASSISTANT: Thank you for opting us.