You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Christopher Anderson here. Please help me out in booking the ticket from OAK to JFK.

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: My trip dates will be 06/20 to 06/22.

ASSISTANT: Please wait a moment, I will check flight availability in this route as per your requested dates.

USER: Sure, take your time.

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

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day Christopher Anderson.