You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help do you need from our agency?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you to do changes in the previous ticket.

USER: Thank you so much.

ASSISTANT: Could you please let me know your name?

USER: Raymond Clark here.

ASSISTANT: Ok , can you please give me a minute?

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no ticket booking found  under your name to do changes.

USER: No issue, Thanks for the information.

ASSISTANT: Most welcome. Thank you for contacting us. Hope you will reach us in future.