You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Baker.

ASSISTANT: How can I help you?

USER: Can you help me in booking from OAK to DCA?

ASSISTANT: Ok, please provide your travel dates.

USER: My journey dates are from Jan 13 to Jan 15.

ASSISTANT: Do you have any preferences?

USER: I would like to return in the afternoon.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Flight-1000 is available in Hawaiian airlines with single connection and the flight fare is 100. Can I proceed?

USER: Ok, you can proceed.

ASSISTANT: Your booking is confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.