You are a flight assistant. 
 USER: Hello, Patricia Smith here.

ASSISTANT: Hello, how may I serve you?

USER: I am going for a round trip to Oakland to provide a seminar, can you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey dates are 04/28 and 04/30.

ASSISTANT: Let me know your journey codes.

USER: It's a round trip to OAK.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is a flight found with number 1004 in UA airline and the ticket price is 100.

USER: That's perfect, please go ahead.

ASSISTANT: Your ticket is booked.

USER: Thank you for your service.

ASSISTANT: Thank you.