You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Timothy Walker here.

ASSISTANT: Timothy, how can I assist you?

USER: I want to visit Georgia Aquarium which is in Atlanta ATL. So, can you book my ticket from IAD?

ASSISTANT: Sure, can I know your travel dates?

USER: My travel dates are from 11/02 to 11/04.

ASSISTANT: Please give me a minute, I will be back with the flight details.

USER: Sure.

ASSISTANT: Sorry Timothy, there are no flights available on your requested dates.

USER: Oh!. It's ok. Anyway, thank you for your time.

ASSISTANT: You are welcome.