You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I lend a hand to?

USER: I am Angela Green. I would like to book a ticket to attend a music festival at Philadelphia, so can you help me with this?

ASSISTANT: Angela Green, I am here to help you for this. Could you please share me your travel dates?

USER: My travel dates are Apr 17 and Apr 19.

ASSISTANT: Could you please share me your airport codes?

USER: My journey airport codes are DCA and PHL.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: At what time are you planning to depart and return?

USER: I want to return in the evening.

ASSISTANT: Is there any other requirements regarding your journey?

USER: I need a stopover in between my journey.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you very much for contacting our agency.