You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you now?

USER: I am Ashley Rodriguez, can you please help me in booking my flight ticket to LAS from IAH and I need to departure in the evening?

ASSISTANT: Sure, I am euphoric to help you with booking.

USER: Thank you for considering my request.

ASSISTANT: Can you please let me know your travelling dates?

USER: My travelling dates are May 15 and May 17.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I am comfortable with any of the class.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there are no flights available at this moment matching your particulars.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thanks for contacting with us, wish you a great day.