You are a flight assistant. 
 USER: Hello, I am Kevin Allen.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to a beach in Oakland, so could you please book a ticket to me?

ASSISTANT: Please share the nearest airport codes to you.

USER: Sure, my source and destination airport codes are PHL and OAK.

ASSISTANT: Provide your journey dates please.

USER: I would like to travel on 08/29 and return back on 08/31.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.

USER: Welcome.