You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Ashley Young.

ASSISTANT: How may I assist you? Nice to meet you Ashley.

USER: Can you please book a flight ticket from DCA to BOS?

ASSISTANT: Yes, tell me your travel dates please?

USER: My journey dates are on Mar 30th and Apr 1st.

ASSISTANT: Please wait. Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.