You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: My holiday vacation has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Sure, I am here to help you, may I know your name?

USER: Sure, my name is Thomas Campbell.

ASSISTANT: Sorry, no reservation found on your name in our database.

USER: No problem, thank you for your  information.

ASSISTANT: Thank you for approaching us.