You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Helen Miller. Can you please help me in booking my flight ticket from HOU to MSP?

ASSISTANT: Your travelling dates please?

USER: My travelling dates are 12/25 and 12/27.

ASSISTANT: I am sorry no flights found on your dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us.