You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight to LAS to visit my home. Can you book a flight from IAH?

ASSISTANT: Sure, can you please share me with your dates of journey?

USER: I will travel on Aug 2nd and return on Aug 3rd. I will return on Aug 4th.

ASSISTANT: May I know your good name please?

USER: My name is Robert Moore.

ASSISTANT: Do you have any other specifications please?

USER: I prefer a connecting flight.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Moore, there is no flight found as per your travelling details.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome.