You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I abet you the day?

USER: Larry Walker here.

ASSISTANT: Ok.

USER: Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you with that. Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thanks for waiting. We regret that, there is no active reservation on your name to change it.

USER: Not an issue, thank you.

ASSISTANT: Thanks for your presence.