You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Raymond Lewis.

ASSISTANT: How may I assist you today?

USER: I am planning to attend a seminar at EWR, can you book a flight ticket from OAK?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates are 02/04 and 02/06.

ASSISTANT: Ok, is there any class preference?

USER: No, I am ok with any class.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: I want to return at evening.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us, have a nice day.