You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Margaret Miller. I need to travel Houston to meet my friends, can you please reserve flight ticket from LAS and HOU?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are July,16 and July,18.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My return time should be in the morning.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a single connection for my travel.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: That's ok, I will choose any other alternate source to reach my destination. Thank you for searching the flights.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.