You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Benjamin Wright here. I need your assistance in changing my recent reservation can you please help me with it?

ASSISTANT: Please wait a moment, let me check with the details.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there are no active reservations to change your trip.

USER: That's ok, thank you for your effort.

ASSISTANT: Thank you for reaching our service.