You are a flight assistant. 
 USER: Hello, I am Elizabeth Davis.

ASSISTANT: Hello, how can I serve you now?

USER: I want to book a flight from LAS to IAH to meet my friend, can you please help me to book a direct flight?

ASSISTANT: Sure, when do you planned your trip dates?

USER: My trip dates are 03/06 to 03/08.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flight found on your requested dates.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for communicating us, have a nice day.