You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am William Lopez, planning to visit Houston. Can you please book me a ticket from IAD to HOU?

ASSISTANT: Sure, on which dates you want this booking?

USER: My preferable journey dates are from 12/21 to 12/23.

ASSISTANT: Ok, please wait a moment I will check for best service on your route.

USER: Sure, take your own time.

ASSISTANT: Ok, there is a flight 1011 in UA airline matching your details with price 300. Shall I proceed?

USER: Please book my ticket with this flight.

ASSISTANT: Ok, your booking is done.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for reaching us, have a nice journey.