You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I would like to meet my cousin on his birthday, please help me to book my flight ticket from ATL to IAD.

ASSISTANT: Sure, let me know your trip dates please?

USER: Sure, I want to depart on Sept 6th and return back on Sept 8th.

ASSISTANT: May I know your connection limit?

USER: I prefer for a single connection.

ASSISTANT: do you have any other preference?

USER: I would like to return back in the evening.

ASSISTANT: Can I know your name please?

USER: My name is Gregory Phillips.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thanks for contacting us.