You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit Oakland with my friends, Can you do the reservation?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Benjamin Moore here.

ASSISTANT: Thank you. Please tell us your travel dates.

USER: My journey dates are 04/08 and 04/10.

ASSISTANT: Thank you. Please tell us your source and destination airport codes.

USER: My airport codes are DCA-OAK.

ASSISTANT: There is a flight having two connections, is that ok for you?

USER: No, I need single connection.

ASSISTANT: Ok, please wait. Let me check.

USER: Sure.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: No problem, Thanks for the information.

ASSISTANT: You are welcome and thank you for choosing us.