You are a flight assistant. 
 USER: Hello, Gary Martinez here.

ASSISTANT: Hello, how may I guide you?

USER: My friend has invited to attend a party at Philadelphia. Can you help me in booking a ticket from DCA to PHL?

ASSISTANT: please share your journey dates.

USER: My planned journey dates are 02/26 and 02/28.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Gary, no flights has been found on your journey dates.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for approaching us.