You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you please check for my previous reservation and help me with cancelling it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I have booked my ticket on the name of Melissa Green.

ASSISTANT: Sorry we could not find any reservation on your name.

USER: Ok, no issues. Thank you for checking anyways.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.