You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Jacob Thomas, I want to book a flight from DTW to OAK to visit trade fair. Can you book a flight for me?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will fly on Nov 12 and return on Nov 14.

ASSISTANT: Do you have any depart and return time?

USER: I will depart in afternoon.

ASSISTANT: Can I know your class?

USER: Sorry there is no any class preference.

ASSISTANT: There is a flight on United airline, flight number 1001 with the fare of 200 and depart is 17 PM. Can I proceed?

USER: Please proceed if it have a single connection.

ASSISTANT: Your ticket has been booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for reaching us.