You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Debra Garcia here. I want to book a flight ticket from DTW to PHX. Can you help me in that?

ASSISTANT: Sure, can I know your travelling dates?

USER: My trip dates are Mar 01 to Mar 03.

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

USER: My depart should be in the morning.

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

USER: I need a direct flight.

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

USER: Ok, no problem. Thank you.

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