You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight ticket from DFW to IAH?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travel dates are 25 to 27 of Sep.

ASSISTANT: Do you have any connection limit?

USER: I want a connecting flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Please wait a second.

USER: Sure, take your own time.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: May I know your name?

USER: I am Kevin Roberts.

ASSISTANT: Thank you for availing us.