You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Dorothy Hill, want to travel from OAK to PHL.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from 06/05 to 06/07.

ASSISTANT: Sorry, there is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.