You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Would it be possible to change my reservation to new trip dates?

ASSISTANT: Sure, Let me know your name to check your reservation?

USER: Ok, I am Michelle Young.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

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: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.