You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have to attend my cousin's marriage in Denver, can you please help me to book the flight ticket from IAD to DEN?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to depart on 09/12 and return back from DEN on 09/14.

ASSISTANT: Give me a minute.

USER: Please book the ticket in the name of Jennifer Allen.

ASSISTANT: There is a flight with number 1009 in airline Frontier.

USER: That's nice, you can book the ticket.

ASSISTANT: Your ticket is booked, happy journey.

USER: Thank you very much.

ASSISTANT: Thank you for contacting us.