You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need your help to book a ticket from MSP to DTW.

ASSISTANT: Could you please provide your travelling dates?

USER: Departure date is 07/14 and return date is 07/16.

ASSISTANT: OK,may I know your name?

USER: My name is Charles Robinson .

ASSISTANT: Sorry, no flights found for this search.

USER: That's really sad. Anyways, thank you for the information.

ASSISTANT: Sorry,thank you.