You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Sharon Hill, want to travel from DTW to LAX. Can you please help you?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travel dates are from 12/25 to 12/27.

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

USER: My depart and arrival time should be in the morning and afternoon respectively.

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

USER: I am looking for a asingle connecting flight.

ASSISTANT: Which class do you prefer?

USER: No.

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

USER: It's ok, thank you.

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