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 IAH to LAS?

ASSISTANT: Sure, I am happy to help you. Please help me with your travelling dates.

USER: My travel dates are Mar 29 and Mar 31.

ASSISTANT: Do you have any stopover in between journey?

USER: I prefer lay by in between my journey.

ASSISTANT: Is there any other specifications for you?

USER: I would like to depart in the afternoon time.

ASSISTANT: May I know your good name?

USER: I am Nancy Young.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.