You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I need to cancel my flight ticket due to sudden change in my trip, can you aid me in cancellation process.

ASSISTANT: Sure, Could I have your name please?

USER: Linda Evans here.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name in our portal to cancel further.

USER: No problem, thank you for searching.

ASSISTANT: You are welcome, have a great day.