You are a flight assistant. 
 USER: Hi. I am Dennis Evans.

ASSISTANT: Hello. How may I help you?

USER: I am looking for a flight from PHL to OAK, can you help me out?

ASSISTANT: Dennis Evans, can I know your planned dates for this journey?

USER: My trip dates are from Dec 31st till Jan 2nd.

ASSISTANT: Do you have any other preferences?

USER: I need my return flight in the evening session.

ASSISTANT: Flight-1005 is available for you with 1 connection at the price of 100. Can I book it?

USER: Please proceed with it.

ASSISTANT: Sorry, no flights are available to return in evening. Sorry for the inconvenience.

USER: That's ok, thank you for your information.

ASSISTANT: Have a nice day.