You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself John Taylor.

ASSISTANT: Taylor, I hope you are fine. What kind of service you are looking from us?

USER: Actually, I am entrepreneur. I have some business meeting, so I want to change my existing reservation. Can you please help me in changing my reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check your reservation status and get back to you.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting, but I did not find any reservation under your name in our database.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: You are welcome and have a nice day.