You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Assist me in cancelling my previous flight reservation. As I modified my journey dates.

ASSISTANT: Sure, may I know your name to check the details.

USER: Ryan Harris here.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Found your recent reservation and successfully cancelled.

USER: Thanks for you help.

ASSISTANT: Thank you for reaching our service.