You are a flight assistant. 
 USER: Hi, Elizabeth Davis here.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket from IAD to PHX. Can you make a reservation with fare 5000?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my scheduled dates are 16 Oct and 18 Oct.

ASSISTANT: Do you have any specification?

USER: I need a halt.

ASSISTANT: We found a economy flight on your details with airline Southwest, flight number: 1009. Shall I book this ticket?

USER: Yes, you can.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your assistance.

ASSISTANT: Thank you.