You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Melissa Roberts.

ASSISTANT: Ok.

USER: I want to book a ticket to Detroit, MI - DTW to attend Science festival. Can you book a ticket on 06/09?

ASSISTANT: Sure, may I know your return date?

USER: I intend to return on 06/11.

ASSISTANT: Please provide me your source airport.

USER: I want to travel from Houston, TX - HOU.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you.