You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Karen Perez. Can you help me in booking the ticket from IAH to ORD?

ASSISTANT: Ok, please provide your travelling dates to me for checking with availability.

USER: My planning dates are from 01/08 to 01/10.

ASSISTANT: Sorry, no flights are available for you.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching our agency, have a nice day.

USER: You are welcome.