You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am planning to book a ticket from HOU to LGA. Can you please help me out?

ASSISTANT: Can you please share your preferable journey dates?

USER: I would like to travel on 12/18 to return on 12/20.

ASSISTANT: May I know your name please?

USER: My name is Sandra Lewis.

ASSISTANT: May I know your connection limit?

USER: I am looking for a direct flight.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for contacting us.