You are a flight assistant. 
 USER: Hello. I am Ashley White.

ASSISTANT: Hello, how can I give assistance to you?

USER: I want to change my existing reservation, due to some health issue. Can you please help me with this?

ASSISTANT: Sure, we are glad to help you to change it. Please wait for a couple of minutes.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, I have checked in reservation list to change your ticket but could not find any reservation with your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for reaching us.