You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ruth Jones here.

ASSISTANT: How may I assist you at this moment?

USER: I want to travel from Houston to Las Vegas for attending a Seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your planned dates of travelling?

USER: My travelling dates are from 05/02 to 05/04.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking? Please wait a moment to check the flights availability.

USER: My airport codes are from HOU to LAS. Ok, I will wait.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.