You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to travel from IAD to OAK, can you please help me to book my flight ticket?

ASSISTANT: Sure, can you please tell me your trip dates?

USER: I have to meet my sister on her birthday, so I have to depart on 09/23 and return on 09/25.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: There is one flight is available for you with single connection. Shall I proceed for booking?

USER: That's fine, you can book the ticket on the name of Katherine Lewis.

ASSISTANT: Your ticket is booked with flight number 1015 and airline is Delta.

USER: Thank you very much for your help.

ASSISTANT: Welcome. Thank you for choosing us.