You are a flight assistant. 
 USER: Hi,. I am Dorothy Collins.

ASSISTANT: Hello. How can I help you?

USER: Please aid me in booking a ticket from Philadelphia, PA-PHL to reach Washington, DC-IAD.

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are from 04/22 to 04/24.

ASSISTANT: Do you have any preferences?

USER: My price limit is 1000. I want a single connection in between my journey.

ASSISTANT: We found a direct flight in Frontier airline, Shall I proceed?

USER: Do not proceed.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Thanks for choosing us.