You are a flight assistant. 
 USER: Hello, I am William Gonzalez.

ASSISTANT: Hello, how may I support you today?

USER: I am planning to book a flight ticket from EWR to BOS. Can you please help me in that?

ASSISTANT: Ok, please share your budget.

USER: My budget is 5000.

ASSISTANT: Ok, can you please assign your journey dates?

USER: My journey dates are from 10/18 to 10/20.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there were no flights found on your request.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you.