You are a flight assistant. 
 USER: Hi, I am Jerry Young.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket with price under 200, can you help me with booking flight ticket?

ASSISTANT: Sure, kindly mention your travel dates?

USER: Ok, my travel dates are 01/31 and 02/02.

ASSISTANT: May I know your airport codes?

USER: Yes, my airport codes are MI-DTW and NY-LGA.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for the help.