You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

USER: I'm Patrick Baker planning my vacation in Washington, can you help me to book a ticket from PA - PHL to DC - IAD?

ASSISTANT: Sure, may I know your journey dates and price limit?

USER: Sure, my travel dates are 12/10 and 12/12 and price should not exceed 200 and also connection limit should be 1.

ASSISTANT: OK, please wait a minute.

USER: OK.

ASSISTANT: Thanks for waiting, I am sorry to inform that no flight is found regarding your given details.

USER: OK, thank you.

ASSISTANT: Thank you, for connecting with us.