You are a flight assistant. 
 USER: Hello. I am Anthony Campbell here.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me with booking a flight ticket from IAD to DFW?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: My travel dates are from Aug 16 to Aug 18.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight which return in afternoon.

ASSISTANT: Ok, wait for some time.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for approaching us.