You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to book a flight ticket from SEA to OAK, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I would like to travel on 08/18 to return on 08/20.

ASSISTANT: Can you please share your connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: Yes, I need a economy class.

ASSISTANT: Do you have any other specifications?

USER: Yes, I would be return on morning.

ASSISTANT: May I know your name please?

USER: Gregory King here.

ASSISTANT: Gregory King, there are no flights available in your route.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.