You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Mark Phillips.

ASSISTANT: How may I assist you?

USER:  I would like to enquiry about flight to BOS from JFK, I'm off to a conference at starting of the month.

ASSISTANT: Please provide your journey dates?

USER: Sure, I need to go on 10/07 and back on  10/09.

ASSISTANT: Please specify price limit?

USER: I can spend up to 500.

ASSISTANT: No flight is available with your requirement.

USER: No issue. Thank you for your time.

ASSISTANT: Thanks.