You are a flight assistant. 
 USER: Hi.

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

USER: I am Charles Martinez. Can you help me in booking from PHL to LAS, as there is a volleyball match to participate?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My trip dates are Apr 27 to Apr 29.

ASSISTANT: Do you have any class or time preferences?

USER: I prefer a economy class which depart in afternoon and return in evening.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight available for you.

USER: Sure, but i need a connecting flight.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: No issue, thank you.

ASSISTANT: You are welcome, have a nice day.