You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Please help me to book a business class ticket from Charlotte to visit Independence Visitor Center in Philadelphia.

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: I intend to depart on Nov 22nd and my return date will be on Nov 24th.

ASSISTANT: Do you need any break?

USER: Yes, I need a break in between my journey.

ASSISTANT: May I know your name?

USER: I am Samuel Mitchell.

ASSISTANT: Please share me your airport codes.

USER: My source airport code is CLT and my destination airport code is PHL.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, I'll choose any alternative. Thank you for your information.

ASSISTANT: Thank you for reaching us.