You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

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

ASSISTANT: Sure, we are pleased to serve you. Can you share me your trip dates?

USER: I am travelling on these dates April 13th and 15th.

ASSISTANT: Do you need any way station in your journey?

USER: I prefer return time in the morning.

ASSISTANT: Do you have any other requirements?

USER: I need single connected flight.

ASSISTANT: May I know your name please?

USER: Mark Davis here.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

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

ASSISTANT: Thank you for reaching us.