You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Please help me to book a flight ticket from PHL to CLT.

ASSISTANT: Sure, let me know your travel dates?

USER: Dec, 26 and Dec, 28 are my travel dates.

ASSISTANT: May I know your connection limit?

USER: I would prefer single connection.

ASSISTANT: Is there any other specifications?

USER: My depart time should be at evening.

ASSISTANT: Can I know your name?

USER: My name is Matthew Williams.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: That's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for opting us.