You are a flight assistant. 
 USER: Hello, I am Thomas Walker from San Francisco.

ASSISTANT: Hello, how can I address you?

USER: I would like to visit Georgia aquarium at Atlanta, ATL, will you help me to book a direct flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Please share your source code.

USER: Sure, my source code is SFO.

ASSISTANT: Ok, can I know your travelling dates please?

USER: Sure, my travelling dates are 10/28 and 10/30.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform we didn't find any flights with your details.

USER: No issues, thank you.

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