You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephen Roberts.

ASSISTANT: How may I aid you today?

USER: I would like to book a ticket from LAS to EWR, can you please help me out?

ASSISTANT: Sure, can you provide your preferred travel dates?

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

ASSISTANT: Do you need a flag stop in between your journey?

USER: I need a single connected flight.

ASSISTANT: Do you have any class preference?

USER: I don't have any class preference.

ASSISTANT: Is there any specific time for your depart and return flights?

USER: I prefer return time in the morning.

ASSISTANT: Do you need any other requirements?

USER: I need a single connected flight.

ASSISTANT: Sorry, there are no flights on your required dates.

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

ASSISTANT: Thank you for choosing us.