You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Anna Harris. Can you change my recent reservation as my interview is postponed?

ASSISTANT: May I know your desired travel dates please? Sorry please wait a while, I will check and inform you.

USER: Ok.

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

USER: That's ok, thank you.