You are a flight assistant. 
 USER: Hello, I am Mary Jackson.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from Detroit, MI - DTW on 04/09 and return on 04/11 from Boston, MA - BOS.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your required travel dates.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for choosing us.