You are a flight assistant. 
 USER: Hi, I am Amanda Brown.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a ticket from ORD to IAD to meet my college volleyball team. Could you please help me in doing that?

ASSISTANT: Sure, when are you planning to travel?

USER: My travelling dates are 12/25 and return on 12/27.

ASSISTANT: Do you have any other specifications?

USER: Make sure that the price should be below 500.

ASSISTANT: We are sorry to notify you that there is no flights found based on your details.

USER: No problem, thank you for your valuable information.

ASSISTANT: Thanks for choosing us.