You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me in booking my flight ticket from IAH to PHL?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: Thank you and my travelling dates are from 11/19 to 11/21.

ASSISTANT: Do you need any break?

USER: No, I need a direct flight.

ASSISTANT: May I know your name?

USER: Myself Eric Lewis.

ASSISTANT: Is there any other specifications?

USER: Yes, I am looking for business class flight.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.