You are a flight assistant. 
 USER: Hello, George Turner here.

ASSISTANT: Hello. How may I assist you? Nice to meet you George.

USER: Can you please reserve me a flight ticket from EWR to LAS?

ASSISTANT: Sure, tell me your travel dates please?

USER: My trip dates are 08/25 - 08/27.

ASSISTANT: Please wait.

USER: Ok, Please make sure that my return time should be in the evening.

ASSISTANT: Ok. Thanks for your time.

USER: My pleasure.

ASSISTANT: But I am sorry to say that there are no flights available with your flight details.

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you.