You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Matthew Nelson. I am planning to visit a NASA space center in Houston, so please book a flight ticket from DEN to HOU.

ASSISTANT: Sure, can you please share your travel dates?

USER: My departure day is Dec 05, return day is Dec 07.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Matthew Nelson, there is a flight available with price 100 and the connection is 1 with UA airline. Would you like me to proceed with the booking?

USER: You can proceed to booking.

ASSISTANT: Your booking is confirmed with 1004 flight number.

USER: Thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.