You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jack Scott, I want to book a flight ticket from DCA to DFW in the month of June.

ASSISTANT: Sure, I will help you out. May I know your travelling dates please?

USER: My travelling dates are 06/20 and 06/22.

ASSISTANT: Ok, please wait a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there are no flights found.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.