You are a flight assistant. 
 USER: Hello, Anthony Anderson here.

ASSISTANT: Hello. How can I assist you?

USER: I planned to travel from IAD to BOS, can you please help me to book a flight ticket?

ASSISTANT: Can I know your travel dates?

USER: I planned to travel on 09/04 and 09/06.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.