You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I need to visit Washington for Christmas shopping with my parents. Can you please book a flight ticket from Houston?

ASSISTANT: Sure, I will help you to book. May I know your chosen dates?

USER: Sure, my travelling dates are 12/20 and return on 12/22.

ASSISTANT: Ok, please share your journey points.

USER: My journey airport codes are from HOU to IAD.

ASSISTANT: Ok, may I know your name for better booking?

USER: Ronald Davis is my name.

ASSISTANT: Ok, please wait Ronald Davis.

USER: Sure.

ASSISTANT: Thank you for waiting, no flights were found based on your schedule.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thanks for picking us.