You are a flight assistant. 
 USER: Hello. I am Deborah Collins.

ASSISTANT: Hello. How may I assist you?

USER: As my friends are planning to meet my college friends so, I want to join them.

ASSISTANT: Ok.

USER: Can you please book a ticket from PHL to DCA?

ASSISTANT: Sure. Can I have your price limit?

USER: Price limit is 500.

ASSISTANT: Please share your journey dates.

USER: Journey dates are 07/21 to 07/23.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a direct flight on your route. May I proceed?

USER: Don't proceed.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Thank you for availing us.