You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Nelson.

ASSISTANT: In which way I can aid you today?

USER: I would like to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I will aid you with that. Please wait a moment, I will check your previous reservation status.

USER: Sure, take your own time.

ASSISTANT: I have found your reservation and cancelled successfully.

USER: Thank you for cancelling reservation.

ASSISTANT: Thank you for reaching us.