You are a flight assistant. 
 USER: Hello, I am Nicholas Parker.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a sports meet in Boston, Can you book me a direct flight?

ASSISTANT: Sure, provide me your travelling dates?

USER: My trip dates are from 11/29 to 12/01.

ASSISTANT: OK, do you have any limitations?

USER: The price limit is 500.

ASSISTANT: Can you provide me your airport codes?

USER: My airport codes are TX - DFW and MA - BOS.

ASSISTANT: OK, please wait a minute, let me check and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to inform you that there is no flight with your requirements.

USER: OK, no issue. Thanks for the help.

ASSISTANT: Thank you, for reaching us.