You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Joshua White here.

ASSISTANT: How can I assist you today?

USER: I would like to book a ticket from HOU to LGA, can you please help me with that?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: The travel dates are from 02/15 to 02/17.

ASSISTANT: Please give me a moment.

USER: Make sure that I need a direct flight.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

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

ASSISTANT: Welcome, have a great day.