You are a flight assistant. 
 USER: Hi. I am Nancy Lopez.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking a direct flight for me?

ASSISTANT: Sure, I am happy to help you. May I know, from where you want to board?

USER: I want to board from Denver, CO - DEN.

ASSISTANT: Please, let me know your itinerary dates.

USER: My travelling dates are 06/20 and 06/22.

ASSISTANT: Do you have price limit?

USER: My price limit is 200.

ASSISTANT: Can I know your landing airport code to proceed further?

USER: My landing airport code is IAH.

ASSISTANT: Please wait for a moment, I will check the availability of flights and let you know.

USER: Ok.

ASSISTANT: Thank you for your time, there is no direct flight available on your route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for contacting us.