You are a flight assistant. 
 USER: Hi, I am Jeffrey Hall.

ASSISTANT: Hello, how may I aid you?

USER: I would like to book a flight ticket to DCA from PHX.

ASSISTANT: May I know your travel dates please?

USER: Can you make a direct flight reservation? Sure, I need to fly on Mar 20 and Mar 22.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no direct flights on your preferable travel dates.

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.