You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I best serve you today?

USER: Can you please help me to book a flight from PHL to CLT?

ASSISTANT: Sure, can you please mention your depart and arrival dates of your journey?

USER: Sure, I want to depart on Mar 18 and need to return on Mar 20.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I need a flight with single connection.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: My depart time must be in the evening.

ASSISTANT: Can I know your good name to proceed further?

USER: Laura King here.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for checking.