You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, just a moment please.

USER: Ok, thank you for accepting my request.

ASSISTANT: I am sorry no reservation found on your name in our database.

USER: Oh! May be I am not booked my ticket properly at that time. Thank you for your service.

ASSISTANT: Thank you for choosing us.