You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit my grand parents house at Charlotte on 04/14, can you help me to book a connecting flight?

ASSISTANT: Sure, do you have any price limit?

USER: I need a ticket with in the price limit 200.

ASSISTANT: Please let me know your name.

USER: I am Donald Hernandez.

ASSISTANT: When do you plan to travel?

USER: My return date would be 04/16.

ASSISTANT: May I know your journey airport codes?

USER: I want to start from PA-PHL to NC-CLT.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thank you for being wait. Unfortunately, there is no flight available with your requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us and have a great day.

USER: Thanks for your assistance.