You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide service to you?

USER: Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues. Will you help me with that?

ASSISTANT: Sure, we will help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Please let me know your name for further process.

USER: Myself Nicholas Hill.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, we could not find any reservation with your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.