You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Richard Miller.

ASSISTANT: How may I assist you?

USER: I already had a 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 help me with that?

ASSISTANT: Sure, I will help you out in this.

USER: Thank you.

ASSISTANT: Please hold on a moment let me check the reservation list and let you know the status.

USER: Sure.

ASSISTANT: Thank you for your time. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for availing with us. Hope to serve you again.