You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to travel to Houston city for vacation. Can you find me a flight?

ASSISTANT: Sure, I am glad to help you. Could you please share your trip dates?

USER: I will travel on 25th of Mar and return on 27th of Mar.

ASSISTANT: May I know your airport codes?

USER: My source point is PHL and my destination is HOU.

ASSISTANT: Do you need direct flight or connecting flight?

USER: For this journey I want connecting flight.

ASSISTANT: Is there any preferences?

USER: No.

ASSISTANT: May I know your name? Sorry, there are no flights found on your journey dates.

USER: My name is Ryan Perez. Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.