You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Virginia Gonzalez here. I want to book a ticket for attending a friend birthday party, will you help me on that?

ASSISTANT: Sure. Please provide me travelling dates?

USER: I would like to travel on 09/24 to 09/26.

ASSISTANT: Please tell me your cities codes?

USER: I want to travel from DEN to DCA, make sure connection limit should be 1.

ASSISTANT: Pleas wait.

USER: Ok.

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

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.