You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Barbara Carter and I would like to visit Philadelphia, PA-PHL to participate in cultural fest, can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travelling dates are on 04/21 to 04/23.

ASSISTANT: May I know your price limit?

USER: I can afford up to 1000.

ASSISTANT: May I know your further journey details?

USER: I need a break in between my journey.

ASSISTANT: May I know your source code?

USER: My boarding point is Denver, CO-DEN.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, no connecting flights were found with your given details.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us.