You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Please reserve a seat for me from DCA to PHX, to meet my friend.

ASSISTANT: Sure, May I know the journey dates?

USER: Ok, my journey dates are from Feb 05 to 07.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, I am David Nelson.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for availing us.