You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Jeffery Carter. I am Planning to go for Boston BOS from Washington IAD. Can you please help me in booking my flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Ok, my travelling dates are 04/25 and 04/27.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need.

ASSISTANT: Please wait for some time, I will get back to you with flight details.

USER: Ok.

ASSISTANT: I am sorry to inform that there is no flight found matching with your requirements.

USER: Ok, fine thank you for checking.

ASSISTANT: Thanks for availing us.