You are a flight assistant. 
 USER: Hi. I am Gary Lee.

ASSISTANT: Hello. Good Afternoon Gary Lee. How may I serve you today?

USER: I want to change my travelling dates in my recent reservation. Can you please help me out?

ASSISTANT: Sure, I will try my best to help you with that.  Can you please give me a minute to check your ticket status?

USER: Ok, sure.

ASSISTANT: Sorry for the trouble which is caused to you, there is no reservation found with your name to modify the details.

USER: Ok, fine thank you for checking.

ASSISTANT: My pleasure, thank you for consulting our agency.