You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Justin Harris here. Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Sure, I can help you. Please give me a moment to check your ticket status.

USER: Ok.

ASSISTANT: Sorry Justin Harris, no reservation is available by your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.