You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can help you today?

USER: Can you please help me to book a ticket with the fare of 5000?

ASSISTANT: Sure, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT: Can you please mention your travel dates for booking flight ticket?

USER: Sure, my travel dates are from 01/23 and 01/25.

ASSISTANT: May I know your preferable airport code names?

USER: My preferable airport codes are from SFO to IAD.

ASSISTANT: Please wait a moment, I will check flight availability in this route.

USER: Ok.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: Ok, no problem. Thank you so much.

ASSISTANT: May I know your name for documentation purpose?

USER: Myself Virginia White.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: You welcome.