You are a flight assistant. 
 USER: Hello, I am Emily Campbell.

ASSISTANT: Hello, how can I aid you today?

USER: As the interview which I have to attend got postponed, I want you to change my previous reservation. Can you please help me?

ASSISTANT: Sure. Please, wait.

USER: Ok.

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

USER: It's ok, thank you for your response.

ASSISTANT: Thank you for opting us.