You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name to check your details in our database?

USER: Reservation was made by Patrick Nelson.

ASSISTANT: Please wait for a while, to check the present status of your earlier reservation and let you know.

USER: Ok.

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: No problem, thank you for your information.

ASSISTANT: Thank you for availing us. Have  a blissful day!.