You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Dennis Miller. Can you please book a ticket for me as I am planning to go for music festival with my friend at Washington, IAD?

ASSISTANT: Sure, please share me your travelling dates?

USER: I want to start my journey on 11/20 and return is on 11/22.

ASSISTANT: Kindly assign me your source code?

USER: Detroit, DTW is my boarding point.

ASSISTANT: Do you have any specifications?

USER: I need a stopover in between my journey.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights with your specifications.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.