You are a flight assistant. 
 USER: Hello, I am Amanda Miller.

ASSISTANT: Hello. How can I aid you?

USER: I want to exhibit my skills at National cultural arts festival in San Francisco, Please book me a ticket from DC - IAD to TX - HOU.

ASSISTANT: Sure, I can help you. Do you need any connecting flight?

USER: I need a direct flight please.

ASSISTANT: Please share me your travelling dates?

USER: I would leave on 07/16 and return on 07/18.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately, there are no flights found according to your requriments.

USER: It's Ok, thanks for your information.

ASSISTANT: Thank you for picking us,.