You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Elizabeth Thompson. Can you help me to book a flight ticket from JFK to IAD?

ASSISTANT: Sure, can you share me your preferable dates?

USER: I am travelling from Jan 4 to Jan 6.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a halt in between my journey. I can afford 200 only.

ASSISTANT: Sorry to say this, no flights are available with your price limit.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.