You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I would like to return from Oakland after completing my board meeting on 01/27. Can you help me book a flight ticket on 01/25?

ASSISTANT: Sure, I'll help you in booking. Do you have any fare preference?

USER: 5000 is my price limit.

ASSISTANT: Is there any connection limit?

USER: I do need a halt within my journey.

ASSISTANT: Could you please let me know your exact airport codes?

USER: I prefer to travel from OAK to DEN.

ASSISTANT: Thanks for providing details, just a moment I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: Ok, thank you for your response.

ASSISTANT: May I know your name please?

USER: My name is Carol Hall.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thank you.