You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Brian Clark here. I have an appointment with a doctor, Can you book a ticket  from OAK to DEN.

ASSISTANT: Ok, please can I know the dates you have planned for the journey?

USER: My travel dates are 01/08 and 01/10.

ASSISTANT: Ok, please can you let me know if you have any preferrence?

USER: Yes,  with a single halt.

ASSISTANT: There is a flight ticket available with 1 connection limit and the airlines is Spirit. Can I book the flight ticket 1027?

USER: Yes, please proceed.

ASSISTANT: The flight ticket is confirmed and the class is economy.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing our agency, have a safe journey.