You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Carolyn Phillips, want to travel from PHL to LGA.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from 04/23 to 04/25.

ASSISTANT: Sorry, there is no flight available.

USER: That's fine, thank you.

ASSISTANT: Welcome.