You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want a flight booking on the route from CLT to LGA meeting my grandfather, please help me.

ASSISTANT: Sure, can I know the travel dates please?

USER: On 07/28 my trip will be starting, I will be returning on 07/30.

ASSISTANT: May I know your name please to proceed further?

USER: Myself Kenneth Evans.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry Evans, there are no flights on your dates.

USER: Oh! that's sad, thank you for checking.

ASSISTANT: You are welcome.