You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Linda Evans. Due to some problems I am unable to travel in flight so can you please cancel my flight ticket?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok, thank you for your positive response.

ASSISTANT: Linda, there is no reservation found under your name.

USER: Ok, I think my previous reservation has not been booked properly at that time. Thank you for your service.

ASSISTANT: You are welcome.