You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Brain Martinez from Denver, CO - DEN. I am planning to attend by cousin's marriage in Houston, TX - HOU , could you please help me in booking a flight ticket?

ASSISTANT: That's great, can I know your travel dates?

USER: I want to attend marriage on 08/01 and return on 08/03.

ASSISTANT: Sorry to say you, there is no flight available on that day.

USER: It's ok, no issues. Thanks for your help and your valuable time spent with me.

ASSISTANT: Thank you for contacting us.