You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a flight from LAS to attend a meeting. Can you book a flight to IAH?

ASSISTANT: Sure, may I know your travel dates?

USER: I will fly on Jan 12 and return on Jan 14.

ASSISTANT: Please share me your name.

USER: My name is Gary Hall.

ASSISTANT: Do you have any specifications?

USER: I want my depart flight in afternoon.

ASSISTANT: Sorry, there is no flight on your particular dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.