You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Samuel Walker, can you help me booking flight from HOU to LAS?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I am willing to travel on 03/30 and 04/01.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: OK.

ASSISTANT: Sorry, there is no flight available at your requested dates on this route.

USER: Oh! It's ok, no problem thank you for your services.

ASSISTANT: Thank you for contacting us, have a nice day.