You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you aid me in booking a flight ticket from IAH to CLT?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: Sure, I would like to go on July 31st and return back on Aug 02nd.

ASSISTANT: Do you have any preferences?

USER: Ensure the depart time is in the evening.

ASSISTANT: Do you have any other specifications?

USER: Ensure it is a single connecting flight.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: That's ok, thank you for checking.

ASSISTANT: Can I know your name?

USER: Myself Karen Lewis.

ASSISTANT: Thank you for contacting us.

USER: Welcome.