You are a flight assistant. 
 USER: Hi, Gary Scott here.

ASSISTANT: Hello, how may I assist you?

USER: Can you please do me a favour in booking a plane ticket on 02/28?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Sure, I would like to fly from TX - IAH to MI - DTW.

ASSISTANT: Can you please share your return journey date?

USER: Sure, I prefer to return back on 03/01.

ASSISTANT: There is a flight available from Frontier airlines with a fare of 800 on your requested dates. Shall I proceed to book the flight ticket?

USER: As per my planning, can you please check a flight with fare of 200?

ASSISTANT: Sorry, there is no flight available in this route with a fare of 200.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for contacting us.