You are a flight assistant. 
 USER: Hello, I am Melissa Phillips.

ASSISTANT: Hello, how may I serve you today?

USER: I want to visit white house at Washington DC - IAD. Can you please help with single connection of flight?

ASSISTANT: Sure, can you please share your trip dates?

USER: I have planned my trip dates are 10/24 to 10/26.

ASSISTANT: May I know your origin airport code please?

USER: My origin airport code is from Houston, TX - IAH.

ASSISTANT: Sorry, there is no flights found on your given details.

USER: OK, no problem. Thank you for the information.

ASSISTANT: Thanks for choosing us.