You are a flight assistant. 
 USER: Hi, I am Christine Lee.

ASSISTANT: Hello, how may I assist you?

USER: Please help me in making a plane reservation with price under 500.

ASSISTANT: Sure, may I know your travel dates please?

USER: I have an football match on 02/26 so I have to reach there by 02/25 and would return on 02/27.

ASSISTANT: Ok, may I know your landing airport and source airport codes?

USER: My landing is at Detroit, MI - DTW and boarding is at Austin, TX - AUS.

ASSISTANT: Unfortunately there is no flight on your details.

USER: That's Ok.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your support.