You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: We are totally 5 sisters among them my 3rd sister birthday is on 06/19.So we are planning to do grand party in Washington, can you please search a flight ticket for me?

ASSISTANT: Sure, can you help me with your travelling airport codes?

USER: I want to start my travel from my work place AZ-PHX and I want to reach for DC-IAD air port.

ASSISTANT: Can you help me with your travelling dates?

USER: My travel dates are 06/18 and 06/20.

ASSISTANT: May I know your name?

USER: Please book my ticket with name Mary Clark, If any you found.

ASSISTANT: Thank you for your details. There is no flight with your details.

USER: Ok, fine not an issue.

ASSISTANT: Ok.

USER: Thank you for your help.

ASSISTANT: You are welcome.