You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I need you to book a flight ticket from DEN to PHL.

ASSISTANT: Sure, May I know the journey dates?

USER: September 14 and 16 are my planned travel dates.

ASSISTANT: Do you have any connection limit?

USER: I need a break in my journey.

ASSISTANT: Is there any other requirements?

USER: I prefer to fly in a normal-cost airlines.

ASSISTANT: May I know your name?

USER: Rachel Smith here.

ASSISTANT: Please wait a minute.

USER: One more thing, please check for a flight that returns in the morning.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for opting us.