You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: William Jackson here. I need to reserve a ticket from IAD to LGA, can you help me in doing that?

ASSISTANT: Sure, I will help you. Can you please share your planned journey dates?

USER: My journey dates are Oct 09 to Oct 11.

ASSISTANT: Let me know your connection limit.

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: My return time must be in afternoon.

ASSISTANT: Please, wait a minute. Thank you for waiting, there were no flights available that matches  with your requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for approaching us.