You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today from my end?

USER: My name is Robert Walker. I want to book a flight ticket from SFO to PHL, can you help me out?

ASSISTANT: Robert Walker, I am here to help you with that. Can you please help me with the dates that you prefer?

USER: Thank you. I will fly on Apr 06 and return on Apr 08.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: Do you have any time preference?

USER: My return time is morning.

ASSISTANT: Robert Walker, sorry to say that there are no flights found on your required route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.