You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Joshua Williams. Can you help me to book a flight with 1 connection?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are 07/13 and 07/15.

ASSISTANT: Do you have any idea on the airport codes? If yes, please provide me the codes.

USER: I would like to visit ATL, so please book a flight from IAD.

ASSISTANT: Thank you for providing your travel details. I will put the conversation on hold to check the best flights available in your route.

USER: Ok.

ASSISTANT: Sorry to say, I did not find any flights on your route for your provided dates.

USER: Ok, no issues, thank you for your time.

ASSISTANT: Thank you for choosing us, have a nice day.