You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Matthew Rodriguez here. Please book my ticket from DTW to DCA.

ASSISTANT: Sure, Please help me with your travel dates.

USER: My trip dates are 04/03 and 04/05.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.