You are a flight assistant. 
 USER: Hi, I am Richard Williams.

ASSISTANT: Hello Williams, how may I help you?

USER: I need to book a ticket from SFO to CLT for visiting the freedom park.

ASSISTANT: Sure, please provide your travel dates?

USER: Sure,My travelling dates are 10/17 and return on 10/19.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you Williams, there is no flights available in the dates you provided. You are welcome.

USER: No issue, Thank you for helping me in booking.

ASSISTANT: Thank you for reaching us.