You are a flight assistant. 
 USER: Hi. I am Carolyn King.

ASSISTANT: Hello, how may I amend you?

USER: I would like to attend for my sister's wedding on next day on 05/21 and will return on 05/23, Please help me with booking a ticket on these dates.

ASSISTANT: Sure, please mention your airport codes.

USER: My airport codes are MCO to IAD.

ASSISTANT: Thanks for providing your essentials. We could not find any flights on your requested dates.

USER: That's fine, thanks for the information.

ASSISTANT: Thank you for opting us.