You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I want to fly from CO-DEN to MA-BOS.

ASSISTANT: Ok, can you provide me your travel dates?

USER: My journey dates are 12/02 and 12/04. Will you please let me know availability of tickets?

ASSISTANT: Sure, may I know your name?

USER: I am Donna Thomas.

ASSISTANT: Sorry, to inform no flight found with your requirement.

USER: OK, no problem. Thank you for sharing information.

ASSISTANT: Thanks for reaching us, have a good day.