You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER:  I'm Sarah Miller. I want to book a ticket to Charlotte, NC - CLT from New York, NY - JFK to attend my grand father's 60th anniversary.

ASSISTANT: May I know your travelling dates?

USER: My depart date is 05/13 and return on 05/15.

ASSISTANT: Sorry to say, no flights found found on your required dates.

USER: Ok, fine. Thanks for your information.

ASSISTANT: Ok, thank you for contacting us.