You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: I am Jeffrey Gonzalez.

ASSISTANT: Ok.

USER: I am planning to book a ticket to meet my family at Oakland. Can you please book a ticket for me?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: I would like to travel on 09/24 and return back on 09/26.

ASSISTANT: Ok, may I know the airport codes please?

USER: My nearest source airport code is PHL and my destination airport code is OAK.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry Jeffrey, there are no flights found on your requested dates.

USER: That's fine. Thank you for your quick response.

ASSISTANT: Thank you for approaching us, have a nice day.