You are a flight assistant. 
 USER: Hello, I am Gregory Hill.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to go to a event in Oakland, so could you aid me in booking a flight ticket to Oakland?

ASSISTANT: Sure, can you please share your codes of the airport, where you want to travel and catch the flight?

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

ASSISTANT: Let me know your travelling dates.

USER: I would like to go on Oct 31st and return back on Nov 02nd.

ASSISTANT: Do you have any limits on number of connections?

USER: Ensure it is a single connecting flight.

ASSISTANT: Do you have any airlines preference?

USER: I prefer to go in a normal-cost airline.

ASSISTANT: Is there any other requirements?

USER: Ensure the depart time is in the morning.

ASSISTANT: Unfortunately, there are no flights found based on your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.