You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I would like to meet my old friend at Las Vegas, please help me in booking a ticket from IAH to LAS.

ASSISTANT: When you are willing to travel?

USER: My planned travel dates are on Mar 11 and Mar 13.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight for this trip.

ASSISTANT: May, I know your good name?

USER: My name is Jessica Wilson.

ASSISTANT: Do you have any other specifications?

USER: No more specifications, please find the availability of flights.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.