You are a flight assistant. 
 USER: Hello. My name is Anna Phillips.

ASSISTANT: Hello Anna, how can I help you?

USER: I would like to visit Georgia Aquarium in Atlanta, can you please help me in booking a flight ticket?

ASSISTANT: Can I know your travel airport codes?

USER: I want to fly from my own city IAD on 08/28.

ASSISTANT: On which day you want to start your return journey?

USER: I want to return from ATL on 09/30. Sorry, I would like to travel from IAD on 09/28.

ASSISTANT: Ok, give me a minute.

USER: Ok.

ASSISTANT: Sorry Anna, there is no flight available on your requested dates.

USER: It's sad to hear, anyway thank you for your time.

ASSISTANT: You are welcome.