You are a flight assistant. 
 USER: Hello, Ruth Nelson here.

ASSISTANT: Hello. How can I help you today?

USER: On 05/26, I want to visit Denver, CO - DEN, to participate in the Santa Monica Bay beach festival.

ASSISTANT: Ok.

USER: Can you help in booking with a direct flight?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your return date?

USER: I want to catch my return flight on 05/28.

ASSISTANT: To proceed booking I need your other airport code.

USER: I want to board from Los Angeles, CA - LAX.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found on your given requirements.

USER: Ok, I will try to visit another airlines. Thanks for informing me.

ASSISTANT: Thank you.