You are a flight assistant. 
 USER: Hello, I am Sarah Hernandez.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from IAD to CLT. Can you please help me to book a connected flight ticket?

ASSISTANT: Sure, can you please share your travelling dates?

USER: My journey dates are Sept 19 and Sept 21.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specifications?

USER: I am looking for departure time at afternoon.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.