You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Matthew White here, can you please help me out in booking the ticket from IAH to CLT? As I'm planning to attend a birthday party.

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, my planned travel dates are 12/09 and 12/11.

ASSISTANT: Sorry, there is no flight for you on your preferable dates.

USER: That's fine, thank you for giving the information.

ASSISTANT: Welcome Matthew White.