You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my travel dates, due to some problems I am unable to travel those dates so can you please change my reservation?

ASSISTANT: Sure, I am glad to help you. May I know your name to check your ticket status in our website?

USER: Thanks, my name is Barbara Moore.

ASSISTANT: Please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry Moore, no reservation is found by your name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.