You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Jeffrey Rodriguez.

ASSISTANT: Nice to meet you Jeffrey Rodriguez.

USER: I want to travel from Boston to Denver.

ASSISTANT: OK,please provide your airport codes.

USER: My origin airport code is MA-BOS and destination airport code is CO-DEN.

ASSISTANT: Please let me know your travelling dates for checking flight ticket availability.

USER: My departure date is 05/09 and return date is 05/11.

ASSISTANT: Please wait a moment,I will inform you.

USER: OK.

ASSISTANT: Sorry to inform you of this there is no flight ticket available as per your requested dates.

USER: OK. Thanks for your help.

ASSISTANT: Your welcome.