You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan King.

ASSISTANT: How can I help you at this moment?

USER: I have to attend a marriage event in April month, so can you book an advance flight ticket from DCA to CLT region?

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

USER: Thank you for considering my request and I would like to move on 04/19 and recur back to my region on 04/21.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: Ok, no problem with that one. I can ask my friend to help me to reach my location.

ASSISTANT: Thank you for contacting us.

USER: Welcome.