You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Help me to cancel my previous flight reservation. As I modified my travelling dates.

ASSISTANT: Sure, May I know your name?

USER: Thanks for accepting my request. Melissa Adams here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No issues. Thanks for checking.

ASSISTANT: Thank you for availing us.