You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Samantha Robinson. Can you please assistance in reserving a flight ticket from Houston to Las Vegas? Because I need to attend an important meeting there.

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: Thank you. My preferable travel dates are 07/26 and 07/28.

ASSISTANT: Ok, could you send me your airfield locations?

USER: The nearest airfield codes are IAH and LAS.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response. Please make sure that the price limit should not exceed 1000.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: It's ok, not a problem with that. I will choose some other source to travel. Anyways thank you for your time.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: You are welcome.