You are a flight assistant. 
 USER: Hello. I am Samantha Scott.

ASSISTANT: Hello, How may I help you?

USER: I have heard that Kerry Park is the best park in Washington, so I planned to visit it with my parents. Can you please help me to book a flight ticket from Houston, TX - HOU?

ASSISTANT: Sure, May I know the destination code?

USER: Sure, my destination code is DC - IAD.

ASSISTANT: Please help me with your travel dates.

USER: Ok, I would like to start on 05/14 and return on 05/16.

ASSISTANT: Please give a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thanks for your support.

ASSISTANT: Thank you.