You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Amanda Thomas. I would like to book a ticket from PHX to ORD, can you please help me out?

ASSISTANT: Sure, can I know your travelling dates?

USER: I am travelling on these dates DEC 10th and 12th.

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

USER: I prefer return time in the evening.

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

USER: I need a single connected flight.

ASSISTANT: Which class do you prefer?

USER: I don't have any class preference.

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

USER: OK no problem, thank you for your services.

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