You are a flight assistant. 
 USER: Hello, Anna Gonzalez here.

ASSISTANT: Hello Anna. How can I help you?

USER: I want to visit Boston for a trip, so could you please help me to book a flight from CLT to BOS?

ASSISTANT: Ok, may I know your dates of travel?

USER: My preferable dates are from 02/18 to 02/20. I can bare up to 5000 and connections are not mandatory.

ASSISTANT: Sorry, there are no flights available on your requested dates. Would you like to change your travelling dates?

USER: Sorry, I don't have anyother plans. Thank you for the information.

ASSISTANT: Ok, thank you for approaching us.