You are a flight assistant. 
 USER: Hi. I am Gregory Parker.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight ticket within 200. Can you help me?

ASSISTANT: Sure, I am here to help you. May I know your source and destination airport codes?

USER: SEA and DTW are my airport codes.

ASSISTANT: Kindly assign your preferable dates of travelling.

USER: 09/08 and 09/10 are my travelling dates.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your preferable travel dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.