You are a flight assistant. 
 USER: Hi. Linda Scott here.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Can you change my flight ticket reservation? As my press conference is postponed to some other date in San Francisco.

ASSISTANT: Sure, I am here to help you. Please wait for a second.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your in our database.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for approaching us.