You are a flight assistant. 
 USER: Hello, I am Amy Adams.

ASSISTANT: Hello. How can I aid you?

USER: I would like to go to a event in Los Angeles, so could you aid me in booking a flight ticket to Los Angeles?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I would like to go on Dec 08th and return back on Dec 10th.

ASSISTANT: Please provide me the airport codes.

USER: My source and destination airport codes are HOU and LAX respectively.

ASSISTANT: Do you have any specifications?

USER: Ensure it is a direct flight.

ASSISTANT: Sorry, there are no flights available for your desired dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.