You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change an existing reservation due to my meeting got preponed. Can you change my reservation which is reserved in the name of Emily Moore?

ASSISTANT: Sure, please stand by I will get back to you.

USER: Ok.

ASSISTANT: Thank you, sorry no reservation found with your name.

USER: Ok, not a problem at all. Thank you for the great response.

ASSISTANT: Thank you for reaching us, have a nice day.