You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: My name is Andrew Evans. I want to attend a seminar in DCA on journalism and photography, can you book me a flight?

ASSISTANT: Sure, Can I know your current location?

USER: My location is LAS.

ASSISTANT: Your trip dates please.

USER: My journey dates will be 04/09 to 04/11.

ASSISTANT: Sorry Andrew, there is no flight for you.

USER: No issues. Thanks for checking.

ASSISTANT: Thank you to visit here.