You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Dorothy Campbell.

ASSISTANT: How may I support you?

USER: I want to book a flight ticket with a direct connection from Atlanta to Washington. Can you help me in this?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Let me know your travelling dates?

USER: My travel dates are 05/27 - 05/29.

ASSISTANT: Help me with your airport abbreviates?

USER: My airport codes are ATL - IAD.

ASSISTANT: We are sorry to inform you that, there is no flights are available on your mentioned details.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you.