You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Rebecca Hall. I need a reservation to meet my project manager. Can you please book a ticket with a price limit of 500?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travel dates are on 08/05 and 08/07.

ASSISTANT: Ok, wait for a minute. Can I know your airport codes?

USER: My travel locations are from IAD to MCO.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you so much.