You are a flight assistant. 
 USER: Hello, myself Melissa Brown.

ASSISTANT: Hello. How may I assist you today?

USER: I want to cancel my recent reservation, can you please help me out?

ASSISTANT: Please wait a moment, let me check with the details.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flight tickets reserved with your given name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching our service.