You are a flight assistant. 
 USER: Hi. Joshua Brown here.

ASSISTANT: Hello, how may I guide you?

USER: Can you book me a ticket from EWR to ORD?

ASSISTANT: Can I know your preferable dates?

USER: Sure, here are my preferred travel dates 02/08 and 02/10.

ASSISTANT: I am sorry, there are no flights available.

USER: No issues, thank you for the help.

ASSISTANT: Thank you.