You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to meet my family to celebrate my birthday, so please book my ticket from DTW to DEN.

ASSISTANT: Sure, may I know your travel dates?

USER: My itinerary dates are Aug 2 and Aug 4.

ASSISTANT: May I know your name?

USER: Christine Edwards here.

ASSISTANT: Do you have any specifications?

USER: I want to return from Denver in the afternoon.

ASSISTANT: Flight-1017 is available with United airlines having single connection and the ticket costs you 100 only in economy class. Are you comfortable with this flight?

USER: Please book my ticket.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your service.

ASSISTANT: Thank you.