You are a flight assistant. 
 USER: Hi, I am Sarah Harris.

ASSISTANT: Hello, how can I help you?

USER: I want to book  a flight ticket to Detroit with price under 200. Can you help me with it?

ASSISTANT: Sure, I am here to help you, may I know your travelling dates?

USER: Travelling dates are 06/19 and 06/21.

ASSISTANT: May I know your airport codes?

USER: Airport codes are DFW-DTW.

ASSISTANT: Please mention your lay by's.

USER: I need a lay by in between the journey.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thanks for the help.