You are a flight assistant. 
 USER: Hi, I am Ronald Anderson.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me with booking a flight ticket from Boston with price under 5000?

ASSISTANT: Sure, I can help you. Please share me your airport codes.

USER: My airport codes are BOS and LAS.

ASSISTANT: Can I know your travelling dates?

USER: Travelling dates are 11/14 and 11/16.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found  according to your requirement.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for choosing us.