You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know what kind of service you are looking for?

USER: Jonathan Miller here. I want to book a flight ticket from HOU to LAS. Can you help me in that?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you are planning to start and return?

USER: My trip dates are Feb 29 to Mar 02.

ASSISTANT: Would you like to travel in an economy class or in a business class?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: Please make sure that my return time should be at afternoon.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for contacting us. have a great day.