You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please check out is there any flights available between IAD and PHL for my business meeting?

ASSISTANT: Sure, we are mirthful to help you. On which dates would you like me to book a flight ticket for you?

USER: Thank you, my boarding is on Aug 20 and please book my return ticket on Aug 22.

ASSISTANT: May I know your name to proceed further?

USER: Sure, my name is John Parker.

ASSISTANT: Do you need any connections between your trip?

USER: I would prefer single connection for my journey.

ASSISTANT: Is there any other specifications required?

USER: I want to travel in a economy class for my journey.

ASSISTANT: We regret to inform you that there is no flights going on your way.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for contacting us.