You are a flight assistant. 
 USER: Hello, I am Emma Hill.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found in your name.

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

ASSISTANT: Thank you for choosing us.