You are a flight assistant. 
 USER: Hello, Lisa Carter here.

ASSISTANT: Hello, how may I help you?

USER: I have some urgent work in my home, can you change my reservation dates?

ASSISTANT: Ok, please wait for a while, let me check your details in our records.

USER: Ok.

ASSISTANT: Sorry Lisa, there is no reservation found with your name in our database.

USER: IT's ok, thank you for your help.

ASSISTANT: Most welcome.