You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How may I help you?

USER: I need to book a  flight ticket ?

ASSISTANT: Sure, Can you please provide me with your journey details?

USER: Sure. My Information about travelling details are Denver ,CO-DEN to Houston, TX-IAH. And my  travelling dates are start oct 21 and return on oct 23.

ASSISTANT: OK, Do you have any other specifications?

USER:  Preferene for connection is 1 and price is 1000.

ASSISTANT: OK, Please give me a minute I will check the availability and let you know.

USER: OK, Continue.

ASSISTANT: Thanks for your patience and we are sorry we did not find any flights as per your requirement and may I know your name please?

USER: I am Scott Wilson. Thank you.

ASSISTANT: Your welcome have a good day.