You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, please inform me, how can I assist you today?

USER: I am Elizabeth Collins. I want to book a flight ticket within a price limit of 5000 to meet my brother in Washington.

ASSISTANT: Sure, when do you planned your trip dates?

USER: My departure day is 06/30, return day is 07/02.

ASSISTANT: Can you please let me know your boarding and landing airport codes?

USER: My source and destination airport codes are FL - MCO, DC - DCA.

ASSISTANT: Ok, please wait for a couple of minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no flight found on your journey dates.

USER: No problem, thank you.

ASSISTANT: Thanks for opting us, wish you a good day.