You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Matthew Martin.

ASSISTANT: How can I help you?

USER: I would like to visit Lady Bird Lake at Dallas with my friend, please help me in booking a ticket from IAD to DFW.

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are 02/05 and return on 02/07.

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

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.