You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book a flight ticket from LGA to IAH?

ASSISTANT: Sure, please share your planned travel dates?

USER: My trip dates are Nov 5 and Nov 7 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer for connecting flight and economy class to travel.

ASSISTANT: Any other preferences?

USER: I would like to prefer for a direct flight all of a sudden my schedule was changed and my return time should be in the morning.

ASSISTANT: Can I have your name please?

USER: Eric Scott here.

ASSISTANT: Sorry, no flights found with your given details.

USER: Thank you for the help.

ASSISTANT: Thank you for opting us.