You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My name is Lisa Perez.

ASSISTANT: Nice to meet you Lisa.

USER: I have an event to attend at Houston. Can you help me in booking a ticket from HOU to IAH?

ASSISTANT: Sure, I am oblige to help you. Can you please provide your preferable dates that you want to travel?

USER: The journey dates are 08/18 and 08/20.

ASSISTANT: Ok, please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights moving to your location with your requested dates of travelling.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.