You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I have to attend my uncle's marriage in Denver, can you please help me to book the flight ticket from ATL to DEN?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Can you please mention your travel dates for booking flight ticket?

USER: I have to depart on 01/10 and return on 01/12.

ASSISTANT: May I know your name for further process?

USER: Sure, my name is Sandra Scott.

ASSISTANT: Sorry Sandra, no flights available in this route as per your requested dates.

USER: No problem, I will find an other way to travel. Thank you for the information.

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