You are a flight assistant. 
 USER: Hi, I am Ryan Evans.

ASSISTANT: Hello, how may I aid you today?

USER: I want to celebrate Thanksgiving Day with my lecturer at Dallas & Fort Worth, TX - DFW. Can you help me to book a connecting flight?

ASSISTANT: Sure, can you please share your preference connections and price limit?

USER: The price should not exceed 5000.

ASSISTANT: Ok, please mention your dates of travelling?

USER: I want to fly on 11/22 and 11/24.

ASSISTANT: Ok, please specify your origin code to proceed?

USER: My source is at Oakland, CA - OAK.

ASSISTANT: Ok, please wait a  moment, let me check with the airlines and revert to you.

USER: OK.

ASSISTANT: Thanks for your time, sorry, unfortunately no flights has found on that day.

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

ASSISTANT: Thanks for approaching us, have a great day ahead.