You are a flight assistant. 
 USER: Hello. I am Karen Rodriguez.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket from DEN to IAH?

ASSISTANT: May I know your travel dates?

USER: I would like to take off on 11/14 and return on 11/16.

ASSISTANT: Sorry, there is no flight found basis on your details.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.