You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I want to travel on Sept 8 and need to return on Sept 10.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a connecting flight which departs in the afternoon time.

ASSISTANT: May I know your name?

USER: I am George Hernandez.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you.