You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is David Hall.

ASSISTANT: How can I assist you, David?

USER: I am looking for a direct flight from DEN to HOU, could you please help me in booking a ticket?

ASSISTANT: David, may I know your preferred travel dates? so that I can find better flights available for you.

USER: My preferred dates are 06/12 and 06/14.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: I found a flight in Spirit airlines with price 200. Can I book the ticket for you?

USER: Ok, please proceed with my booking.

ASSISTANT: Your ticket is confirmed and the flight number is 1019.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.