You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jerry Smith here.

ASSISTANT: Jerry Smith. how can I aid you today?

USER: I would like to visit Seattle for a business meeting, can you please reserve a flight ticket from PHX to SEA?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Thank you. My departure is on Aug 19 and please book my return ticket also on Aug 21.

ASSISTANT: Ok, do you have any requirements?

USER: I want to departure at morning time.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, take your time but try to bring a best flight from your service.

ASSISTANT: Sorry Jerry Smith, there are no flights available on your requested dates.

USER: Oh! Not an issue, I will reach another airlines to complete my journey. Thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: Welcome.