You are a flight assistant. 
 USER: Hi, Joseph Brown here.

ASSISTANT: Hello. How may I serve you?

USER: On 12/01, I need to meet my company CEO for the purpose of the emergency meeting. So that, I need to book a ticket. Can you book me a connecting flight?

ASSISTANT: Sure, can you please share me your return date?

USER: I intend to return on 12/03.

ASSISTANT: Please share me your airport codes?

USER: I would like to board from Washington, IAD to reach Denver, DEN.

ASSISTANT: We found a flight on your details with airline Delta, flight number: 1018.

USER: Ok, proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thank you.