You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Please help me to book a flight from LAS to PHL.

ASSISTANT: Sure, could you please share your journey dates?

USER: Sure, I want to travel on July 27 and return on July 29.

ASSISTANT: May I know your good name?

USER: Deborah Lee here.

ASSISTANT: Do you have any specifications?

USER: I need a flight with single connection.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.