You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Frank Lopez. I want to book a flight ticket from Oakland CA-OAK to meet my sister after a long time and enjoy the holiday trip.

ASSISTANT: Sure, when are you willing to travel?

USER: Can you please aid me in booking a flight ticket to Washington DC-IAD?

ASSISTANT: Ok, help me with your travelling dates?

USER: I am willing to travel on 04/15 and 04/17.

ASSISTANT: Ok, any other requirements?

USER: I need a halt.

ASSISTANT: Ok, no flights found with your requested details.

USER: I can spend upto 500. Ok, not an issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.