You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you please help me out?

ASSISTANT: Ok, I will help you with that, please mention your name to check your reservation status.

USER: Thank you for considering my request.

ASSISTANT: Thanks for your response, wait a moment I will revert you back with the proper information.

USER: My name is Sarah Walker. Sure.

ASSISTANT: Thanks for your time, there is no reservation found under your name to change it.

USER: It's ok, anyways thank you for the information. It might be done with another source.

ASSISTANT: Thanks for approaching us.