You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Robert Edwards here. Can you please book a ticket to DFW from BOS now?

ASSISTANT: Can I know your preferable dates?

USER: Ok, here are my preferred travelling dates 03/04 and 03/06.

ASSISTANT: I am sorry, there are no flights matching with your preferences.

USER: No issues, thank you for the help.

ASSISTANT: Thank you, have a good day.