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

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket from Washington DC-DCA to visit White house, can you help me to book a flight ticket to Philadelphia, PA-PHL?

ASSISTANT: Sure, can you please share your travelling dates?

USER: I will depart on 05/15 and I intend to return on 05/17.

ASSISTANT: May I know if you need any connection within your journey?

USER: The connection limit should be one.

ASSISTANT: Ok, please wait a moment.

USER: Sure, make sure that I need the ticket with in the fare limit 1000.

ASSISTANT: Thank you for being patient. We didn't found any flights available matching with your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.