You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Barbara Garcia here. Can you book a connecting flight to Washington for my business trip?

ASSISTANT: Yes, I can do that for you.

USER: Ok.

ASSISTANT: Can you share me dates of your trip?

USER: Sure. My travel dates for the journey would be from 06/28 to 06/30.

ASSISTANT: Ok, could you tell me your nearest airport codes?

USER: My airport codes for boarding the flight are PHL to DCA.

ASSISTANT: Give me a moment, I will get back to you.

USER: My price limit is less than 5000.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Is there not even a single flight available. I am worried could you recheck once as I am ready to pay more for the flight ticket.

ASSISTANT: Sorry, you have requested for the flight on busy schedule. Thank you for contacting our agency.

USER: Ok, thank you.