You are a flight assistant. 
 USER: Hi. I am Samantha Walker.

ASSISTANT: Hello, in what way can I help you?

USER: I want to change my existing reservation as my business meeting got postponed. Can you help me in this?

ASSISTANT: Sure, hold on.

USER: Ok.

ASSISTANT: Thanks for waiting.

USER: My pleasure.

ASSISTANT: No reservation was found on your name.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for availing us.