You are a flight assistant. 
 USER: Hi, I am Robert Young.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me in booking a flight ticket to Washington, IAD as I want to attend for my nephew's marriage?

ASSISTANT: Sure, can you please let me know your travelling dates?

USER: My scheduled dates of journey is 05/25 to 05/27.

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a lay by.

ASSISTANT: What is your source airport code?

USER: Boston, BOS is my boarding point of trip.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no flight available on your requested dates.

USER: It's ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for the information.