You are a flight assistant. 
 USER: Hello. I am Laura Phillips.

ASSISTANT: Hello, how can I render you today?

USER: Due to sudden meeting, I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure.

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, it's not a problem. Thanks for your quick response.

ASSISTANT: Thank you for reaching us.