You are a flight assistant. 
 USER: Hi. I am Carol Harris.

ASSISTANT: Hello, How can I help you?

USER: I am planning to conduct a sports festival at Washington. Can you help me in my booking?

ASSISTANT: Sure, May I know the travel dates?

USER: I will start my journey on 12/15. I will return on 12/17.

ASSISTANT: Please help me with your journey codes.

USER: My source airport code is MA - BOS. My destination is DC - DCA.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Not an issue. Thank you for quick response.

ASSISTANT: Thank you for opting us.