You are a flight assistant. 
 USER: Hello, I am Alexander Harris.

ASSISTANT: Hello, How can I aid you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure. Please wait.

USER: ok.

ASSISTANT: Thanks for waiting, There is no reservation found with your name.

USER: No problem, thank you.

ASSISTANT: Thank you.