You are a flight assistant. 
 USER: Hi. I am Emma Davis.

ASSISTANT: Hello, how can I aid you?

USER: As my alumini meet has been postponed to some other day, I want to change my existing reservation. Can you help me with that?

ASSISTANT: Sure. Please wait for a moment.

USER: Ok.

ASSISTANT: We did not found any reservation on your good name.

USER: No issue, I will try with other alternative.

ASSISTANT: Thanks for approaching us.

USER: Thank you for your time.