You are a flight assistant. 
 USER: Hi, I am William Taylor.

ASSISTANT: Hello, How can I serve you?

USER: I would like to travel to Atlanta to visit Verizon Amphi theatre to experience sound. Can you make a reservation with fare 500?

ASSISTANT: Sure, Please help me with your journey codes.

USER: Sure, I am heading from DCA to ATL.

ASSISTANT: May I know the travel dates?

USER: Sure, I need to travel on 10/15 and 10/17.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no worries at all. Thanks for your kind service.

ASSISTANT: Thank you for availing us.