You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you help me in booking my flight ticket from BOS to IAD?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: My trip dates will be Dec 22nd to Dec 24.

ASSISTANT: May I know your name please?

USER: I am Nancy Martin.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.