You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Garcia here.

ASSISTANT: John Garcia, how can I aid you today?

USER: I would like to go to visit PHX, can you help me in reserving my flight from IAD?

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

USER: Sure, my travel dates are May 16th and 18th.

ASSISTANT: Ok, do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Sorry John Garcia, there are no flights available on your requested dates.

USER: Ok, no problem. Anyways, thank you.

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