You are a flight assistant. 
 USER: Hello, my name is Thomas Moore.

ASSISTANT: Hello, how can I serve you?

USER: I want to visit to National Museum of Natural History in Washington. Can you aid me for booking from Seattle, WA - SEA?

ASSISTANT: Sure, please provide me your travelling dates?

USER: Sure, my travelling dates are on 08/04 to 08/06.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a halt in between my journey.

ASSISTANT: To confirm your booking, please share me your origin code?

USER: Sure, my origin airport code is DC - IAD.

ASSISTANT: OK, please wait for few minutes.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your requirement. Thank you for reaching us.

USER: Thanks for your help.