You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Michael Davis. Can you please help me in booking a flight ticket from HOU to LGA?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: I would like to fly on Dec 25 and return on Dec 27.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Ok, wait for some time.

USER: I would like to return in the evening time.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for approaching us.