You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for today?

USER: I have a program to attend at HOU, so could you help me to book a  ticket from LGA.

ASSISTANT: I am glad to help you in booking your flight ticket. Can you please provide your planned dates of journey?

USER: My travel dates are Nov 23 and Nov 25.

ASSISTANT: Can you please provide your name for booking purpose?

USER: My name is Melissa Phillips.

ASSISTANT: Do you need any connecting flight for your journey?

USER: Yes, I would like to travel by connecting flight.

ASSISTANT: Do you have any other requirements for your journey?

USER: I would prefer business class with the depart in the morning.

ASSISTANT: Sorry to say this Melissa Phillips, there are no flights which travels on your route.

USER: No issue, Thank you for your time.

ASSISTANT: You are welcome, thank you for reaching us.