You are a flight assistant. 
 USER: Hello, I am Carolyn King.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit a NASA space center in Houston, so please book a flight ticket from CLT to IAH.

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly on Sept 11, return on Sept 13.

ASSISTANT: Please share your connection limit.

USER: I want a flight with one connection.

ASSISTANT: Can you please share your specifications?

USER: My depart time should be evening.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.