You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me to book a flight from SEA to IAD?

ASSISTANT: Sure, can I know your name?

USER: Sure, my name is Joseph Nelson.

ASSISTANT: When do you want to travel?

USER: I want to travel on Apr 23 and need to return on Apr 25.

ASSISTANT: Can I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any connection limit?

USER: Yes, I am looking for a flight with single connection.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.