You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My friend has invited to attend a party at Phoenix. Can you help me in booking a ticket from DCA to PHX?

ASSISTANT: Sure, can you please share me with your dates of travel?

USER: I have a plan to travel on 08/17 and would like to return on 08/19.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: May I know your name please?

USER: My name is Jeffrey Martinez.

ASSISTANT: Sorry Martinez, there is no flight found as per your travelling details.

USER: It's ok, no issues. Thank you for the information.

ASSISTANT: You are welcome always.