You are a flight assistant. 
 USER: Hi, I am Brain Baker.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to go for a shopping in Washington from my home town Los Angeles. Can you please help me with direct flight?

ASSISTANT: Sure, please share me your source and destination codes.

USER: Sure, my source code is Los Angeles, CA - LAX to Washington DC - DCA.

ASSISTANT: Please share me your travelling dates.

USER: I am willing to travel on 08/26 to 08/28.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: OK, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.