You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: Can you please help me to book a flight ticket from SFO to PHX?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, my trip dates are Mar 08 and Mar 10.

ASSISTANT: Do you have any preferences?

USER: My class preference is economy.

ASSISTANT: May I know your name please?

USER: My name is Betty Johnson. My return time is morning.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.