You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any assistance from us?

USER: I am Jennifer Hernandez. I would like to book a ticket to Washington DC, can you please help me out?

ASSISTANT: Sure, may I know your planned journey dates?

USER: I am travelling on these dates 07/15 and 07/17.

ASSISTANT: Ok, please tell em your source and destination codes.

USER: I am flying from JFK to DCA.

ASSISTANT: Sorry, there is no plane in your planned month.

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

ASSISTANT: My pleasure, have a great day.