You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Gregory Brown, want to travel from CLT to PHL. Please help me in ticket booking.

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 08/22 to 08/24.

ASSISTANT: Sorry, there is no flight found with your name in our records.

USER: It's ok. Thank you for your help.

ASSISTANT: Most welcome.