You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: Virginia Carter here. I would like to fly from DEN, would you please aid me in booking a flight ticket to HOU?

ASSISTANT: your travelling dates please?

USER: My planned travelling dates are 08/19 and 08/21.

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

USER: No issues, thank you for your response.