You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George Martinez.

ASSISTANT: George Martinez. How may I help you?

USER: I want to book a ticket from DTW to ATL to attend seminar, can you help me in booking?

ASSISTANT: Sure, can you provide me with the travel details.

USER: I am departing on Aug 23 and return on Aug 25.

ASSISTANT: Give me a moment please.

USER: Sure.

ASSISTANT: Sorry to inform that there are no flights on your desired dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.