You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Carolyn Williams and I need to book a flight ticket from EWR to IAD to enjoy flower festivals. Can you make a reservation with fare 500?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my journey dates are Sep 23 and Sep 25.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

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

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

ASSISTANT: You are welcome.