You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best support you today?

USER: I am Catherine Smith. Please book a flight ticket from SEA to CLT.

ASSISTANT: Sure, please share me your trip dates.

USER: Sept, 23 and Sept, 25 are my preferred travel dates.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: Do you want to travel in connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Please share if you want to travel in any specific time?

USER: I want to return on evening time.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for communicating with us.