You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need your help in changing my flight ticket which is reserved before. As I have decided to travel my journey on another day due to some other reasons. Can you help me in that?

ASSISTANT: Sure, I am glad to help you. May I know your name?

USER: I am Robert Martinez.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry Robert Martinez, no reservation is available by your name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.