You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I want to visit United State Capitol at Washington, can you please book a flight ticket for me?

ASSISTANT: Yes sure. May I know your travelling dates and details?

USER: My trip dates are from 07/01 to 07/03. My airport codes are LGA and IAD.

ASSISTANT: May I know your name?

USER: I am Kathleen Clark.

ASSISTANT: Sorry, there is no flight available to your dates.

USER: Ok, no issues.

ASSISTANT: Thank you , have a nice day.

USER: Thank you.