You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you find a flight for me from DFW to LGA?

ASSISTANT: Sure, may I know your travelling dates?

USER: Ok, my travel dates should be from Jan 26 to 28.

ASSISTANT: Do you need a single connecting flight?

USER: I need a connecting flight.

ASSISTANT: May I know your other preferences?

USER: I don't have.

ASSISTANT: May I know your name?

USER: Sure, I am Justin Miller.

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

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.