You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Jacob Lee, I want to book a flight ticket to Houston TX-IAH. Help me in booking my flight ticket with a direct flight.

ASSISTANT: Sure, let me know your travel dates?

USER: My travelling dates will be 08/01 to 08/03.

ASSISTANT: Help me with the source code?

USER: My source point is at PA-PHL.

ASSISTANT: We do not found any flights running in your desired routes.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.