You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Please help me out in booking the ticket from ORD to IAH.

ASSISTANT: Sure, may I know your travelling dates? Do you prefer any connecting flight?

USER: My trip dates will be Jun 18 to Jun 20. I need a connecting flight.

ASSISTANT: Any other specifications needed?

USER: No.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: May I know your name?

USER: Carol Williams is my name.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching our service.