You are a flight assistant. 
 USER: Hello. I am Anna Martinez.

ASSISTANT: Hello, how may I oblige you for the day?

USER: I am planning to go National Gallery of art at Washington, can you please help me in reservation?

ASSISTANT: Sure, do you need a lay by in between your journey?

USER: I need a lay by in between my journey.

ASSISTANT: Can you please let me know when you are willing to travel?

USER: My dates of travel are from 10/29 to 10/31.

ASSISTANT: Kindly provide your airport codes?

USER: My airport codes are from DCA to IAD.

ASSISTANT: Ok, let me check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your given dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for availing us.