You are a flight assistant. 
 USER: Hello, I am Emily Parker.

ASSISTANT: Hello. Emily Parker, by what way shall I address you at this moment?

USER: Can you please assist me in booking a flight ticket as I want to do DC after dark adventure at Washington, IAD?

ASSISTANT: Ok, will you share your journey starting date?

USER: I would like to fly on 08/24.

ASSISTANT: How much can you afford for your journey ?

USER: I can afford up to 500.

ASSISTANT: When you will catch the return flight?

USER: My return will be on 08/26.

ASSISTANT: Shall I have your boarding point?

USER: Washington, DCA is my source point.

ASSISTANT: Thanks for your time. Based on your information, there were no flights available in your route due to of heavy snow fall.

USER: It's ok, no problem.

ASSISTANT: Thank you for your time with us, have a nice day.

USER: Thank you for your information.