You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, I will help you in cancelling the reservation. May I know your name please?

USER: Sure, my name is Margaret Robinson.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.