You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Taylor here.

ASSISTANT: How may I assist you?

USER: I want to travel on these days that is on 12/23 and return on 12/15. Can you make a reservation for me?

ASSISTANT: Yes, can you tell me your nearest airport codes?

USER: Sure, my exact airport codes are from DFW to OAK.

ASSISTANT: Give me a moment.

USER: Ok, make sure that the connection limit 1.

ASSISTANT: Can you recheck your dates of travel?

USER: I want to change my return date 12/25.

ASSISTANT: I have found a flight ticket with a price of 300 and 1 connecting flight.

USER: Yes, you can proceed with the booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting our agency.