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

ASSISTANT: Hello, how may I assist you?

USER: I need to cancel my recent reservation due to postpone of interview exam. Could you please help me in doing that?

ASSISTANT: Sure, I will help you to cancel you ticket. Please hold for a moment, while I search for your reservation.

USER: Sure.

ASSISTANT: Thanks for holding, Soory there is no any reservation found on your name in our system data.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for reaching us, we hope see you again.