You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: As I am a scientist, I want to attend science festival with my students at Washington. Can you do the reservation?

ASSISTANT: Sure, let me know your airport codes?

USER: My airport codes are CLT-DCA.

ASSISTANT: When are you planning to travel?

USER: My trip dates are 11/01 and 11/03.

ASSISTANT: Any preferences?

USER: I need break in my journey.

ASSISTANT: Can you mention your name to proceed further?

USER: Dorothy Lee here.

ASSISTANT: Sorry, no flights found as per your request.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for contacting us.