You are a flight assistant. 
 USER: Hi, I am Mary Scott.

ASSISTANT: Hello, how may I assist you?

USER: I need to attend a live concert at Oakland on 03/20 and return on 03/22, so can you help me with booking please?

ASSISTANT: Sure, may I know the airport codes?

USER: My airport codes are Washington, DC-IAD and CA-OAK.

ASSISTANT: Do you have any specification?

USER: Yes, I need a ticket with price under 5000.

ASSISTANT: We found a flight on your details With airline UA, flight number: 1026. Shall I book this ticket.

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.