You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I would like to meet my friend at Detroit, could you please help me to book my flight ticket from OAK to DTW?

ASSISTANT: Sure, may I know the dates of your journey?

USER: Thank you. I would like to depart on Apr 1st and return back on Apr 3rd.

ASSISTANT: May I know your specification for this journey?

USER: Yes, I want to depart in the afternoon.

ASSISTANT: Ok, please can I know your name to book a ticket if there is a flight available?

USER: My name is Rachel Jones.

ASSISTANT: Sorry, there are no flights available to book a ticket.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: You are welcome, thank you for choosing our agency.