You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Evans.

ASSISTANT: How may I help you today?

USER: I would like to book a ticket from JFK to IAH, can you please help me out?

ASSISTANT: Sure, I will help you with that Evans. Can you please let me know your planned dates of your journey?

USER: I am travelling on these dates 02/19 and 02/21.

ASSISTANT: Please wait for sometime to check the available flight.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.