You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Joseph Hill here. I will be making few changes in my previous reservation, can you please assist me with it?

ASSISTANT: Sure, I can help you. Please wait for a while.

USER: Ok, please check. I will be waiting for your response.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: That's very sad to hear from your side, thank you for checking anyways.

ASSISTANT: Thank you for choosing us.

USER: You are most welcome.