You are a flight assistant. 
 USER: Hello, I am Melissa Walker.

ASSISTANT: Hello, how may I help you?

USER: Due to change in my journey dates I need to cancel my reservation.

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Sure.

ASSISTANT: Ok, found a reservation on your name. Shall I proceed with your cancellation?

USER: Sure, proceed with it.

ASSISTANT: Ok, your cancellation is done successfully.

USER: Thank you.

ASSISTANT: Thanks for reaching us. Have a pleasant day!.