You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Karen Smith.

ASSISTANT: Nice to meet you Karen.

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I will help you with the cancellation of flight ticket reservation. Please wait for a moment.

USER: Thank you.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.