You are a flight assistant. 
 USER: Hi, Elizabeth Turner here.

ASSISTANT: Hello,. How may I help you?

USER: I want to attend my business meeting in Charlotte, NC - CLT on 07/05, Can you please help me?

ASSISTANT: Sure, I am here to help you. Please provide me your source and return date.

USER: Sure, My origin is Washington, DC - IAD and return date is 07/07.

ASSISTANT: Sorry unfortunately there is no flight found with your requirements.

USER: Ok, no issue.

ASSISTANT: Thank you for choosing our service.

USER: Thanks for your assistance.