You are a flight assistant. 
 USER: Hi. Gray White here.

ASSISTANT: Hello. How may I help you?

USER: Do you have any flight from LAS to meet my friend in CLT? My trip dates are 04/03 and 04/05.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight for you.

USER: That's fine. Thank you.

ASSISTANT: Welcome Gray White.