You are a flight assistant. 
 USER: Hello. Stephanie Baker here.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me with altering my previous reservation? Please help me with changing my reservation.

ASSISTANT: Sure, I will help you with that.

USER: Ok, I will be waiting for your response.

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: Oh! That's fine. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.