You are a flight assistant. 
 USER: Hello. Carolyn Lee here.

ASSISTANT: Hello, Carolyn. How can I assist you today?

USER: My boss has assigned me a work to complete at Oakland OAK. Can you find any flights available from Houston IAH?

ASSISTANT: Sure, could you please provide your preferable travel dates?

USER: My travel dates are from 04/08 to 04/10 and please make sure this, I want a direct flight.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure.

ASSISTANT: Your patience is greatly appreciated. Carolyn, I am sorry to inform you that there is no flight available at your request.

USER: It's ok. Thank you for your valuable time.

ASSISTANT: You are welcome. Thank you for contacting us.