You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I have planned to cancel my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: Sure, I will help you with that. Please mention your name for checking the reservation status.

USER: Karen Hill.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

ASSISTANT: There is no reservation found under your name.

USER: No problem, thank you for searching.

ASSISTANT: Welcome, have a great day.