You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jeffrey Lee.

ASSISTANT: How can I help you Lee?

USER: Due to some personal issues, I would like to change my reservation to some other date. Please help me.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Ok,.

ASSISTANT: There is no reservation on your name in our database.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for opting us.