You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a ticket from IAH to DFW to attend my friend's birthday party, can you help me?

ASSISTANT: Sure, may I know your name please?

USER: I am departing on Sep 08 and return on Sep 10. My name is Edward Hall.

ASSISTANT: May I know your airline preference to travel?

USER: I do not have any airline preference.

ASSISTANT: May I know your connection limit please?

USER: I prefer a connecting flight.

ASSISTANT: Sorry to inform you that, there is no flight found as per your travelling dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.