You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I want to book a ticket from PHL to DEN, can you please help me to book a ticket?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My travelling dates are on Sept 18 and Sept 20.

ASSISTANT: Do you want a connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Is there any other requirement related to booking?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is Ryan Williams.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you visiting us, we hope see you again.