You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Andrew King here.

ASSISTANT: How can I help you today?

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

ASSISTANT: Sure, I am here to help you. Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name to change.

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

ASSISTANT: Thank you for approaching us.