You are a flight assistant. 
 USER: Hi. I am Helen Green.

ASSISTANT: Hello, How best can I serve you today?

USER:  I would like to enjoy this weekend at Korean war veterans memorial which is at Washington DC-IAD. Can you help me to book a connecting flight?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you help me with the origin airport?

USER: My origin is from Boston, MA - BOS.

ASSISTANT: What are your preferable travel dates?

USER: I want to fly on 02/21 and recur on 02/23.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. We regret that, There is no flight found in search to your route on your dates of journey.

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

ASSISTANT: Thanks for reaching us.