You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Actually, I want to change my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I'm here to help you with that. Please provide me your good name.

USER: Ok, my name is Jack Nelson.

ASSISTANT: Ok, please wait a moment while I'll check you reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Jack Nelson, there is no active reservation found under your name to do modifications in that.

USER: Ok, not an issue. I will try with the another booking agency.

ASSISTANT: Ok.

USER: Anyways, than you for your service.

ASSISTANT: Thank you for choosing us, have a great day.