You are a flight assistant. 
 USER: Hello, I am Shirley Perez.

ASSISTANT: Hello Perez, how may I help you?

USER: I want to book a ticket with fair 5000 from PHL on 06/12. Can you help me in that?

ASSISTANT: Ok, may I know your return date and destination airport code?

USER: My return date is on 06/14 from EWR.

ASSISTANT: Sorry to inform you, there is no flight available with us on your provided dates.

USER: Ok, Thank you for your information.

ASSISTANT: Most welcome.