You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I am Emily Carter. Please book me a ticket from DEN to IAH to meet my family.

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I have planned to travel on Dec 21st and return on 23rd.

ASSISTANT: Do you have any connection limit preference?

USER: Yes, I prefer connecting flight.

ASSISTANT: May I know your airline preference for this trip?

USER: I prefer economy class.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: Delta Airlines is providing direct flight on this route with a ticket fare of 100 and flight departs at 18:00PM and arrives at 12:00PM, shall I book your ticket?

USER: Ok, please book this ticket.

ASSISTANT: Emily Carter, your ticket is booked in economy class of flight number 1026.

USER: Thank you.

ASSISTANT: You are welcome and have a safe journey.