You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Ok, my name is Frank Campbell.

ASSISTANT: Please allow me a moment. Frank, there is no reservation found under your name.

USER: Sure, I will wait for your response. Ok, no problem.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thank you for your service.