You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Please make a reservation with the name of Andrew King from DCA.

ASSISTANT: To where shall I make your reservation from DCA?

USER: I am heading to OAK.

ASSISTANT: Andrew King, on which dates are you suppose to travel for this journey?

USER: I want to travel on 21st Mar and return on 23rd Mar.

ASSISTANT: May I know your depart time for this journey?

USER: I want to depart on the afternoon.

ASSISTANT: Do you need any stopover between your journey?

USER: I need a stopover in between my journey.

ASSISTANT:  I apologise to say this Samuel Hill, there are no flights which travels to your region as per your departure time.

USER: Not an issue, thank you for the information.

ASSISTANT: Sorry for the inconvenience caused.