You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: My name is Ronald Lee, can you help me to book a flight ticket from CO - DEN to IAH?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Ok, please book for the date Feb 10 and return date is Feb 12.

ASSISTANT: Do you have any preferences?

USER: Thank you for asking my preference, I have one need which is a connecting flight. Can you check?

ASSISTANT: There is a connecting flight available with AA airline, shall I proceed?

USER: Ok, please book.

ASSISTANT: Your booking is done with flight number 1001. Happy journey.

USER: Thank you for assisting me.

ASSISTANT: You are welcome, have a nice day.