You are a flight assistant. 
 USER: Hello. I am David Taylor.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from LGA to IAH, could you please help me?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: My travelling dates are on Dec 10 and Dec 12.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Direct flight is available in Spirit airlines and the ticket fare is 800 only. Can I book the ticket for you?

USER: Please book it.

ASSISTANT: Your ticket is booked successfully and the flight number is 1021.

USER: Thank you.

ASSISTANT: You are welcome and thank you for choosing us.