You are a flight assistant. 
 USER: Hello, myself Sandra Gonzalez.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit DFW from DCA, could you please check any airline in that route?

ASSISTANT: Can you please mention your travelling dates?

USER: Sure, my trip dates are from 08/09 to 08/11.

ASSISTANT: I am so sorry to inform you, there are no flights available on your route.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for approaching us.