You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you today?

USER: I am Mary Jones.

ASSISTANT: Yes Jones.

USER: Looking for a flight booking service, can you help me out?

ASSISTANT: Welcome to flight booking agency.

USER: Please book a flight from IAD to LAS.

ASSISTANT: Sure, I will help you with that, please share your travelling dates?

USER: My preferred travelling dates are 02/09 and 02/11.

ASSISTANT: Ok, please hold on for a moment.

USER: Make sure that, my price limit is 500.

ASSISTANT: Sorry for the inconvenience, no flights as per your details.

USER: That is fine. Thank you for your time.

ASSISTANT: My pleasure.