You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Catherine Walker. I want to meet my hubby at Washington. Can you help me with book a flight ticket to DCA?

ASSISTANT: Sure, can you please help me with your source point?

USER: My source code is LAX.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are from 09/30 to 10/02.

ASSISTANT: Thank you for your details. Sorry, we did not found any flights based on your given details.

USER: Ok, No problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.