You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket to Denver for attending my cousin's wedding. Can you please help me to book a flight ticket from IAH - DEN?

ASSISTANT: May I know your travel dates please?

USER: Sure, my travel dates are 06/24 and 06/26.

ASSISTANT: May I know your name for further proceedings?

USER: Yes, I am Pamela Lewis.

ASSISTANT: Sorry, Lewis there is no flights to your destinations on your preferable dates of journey.

USER: Not an issue, anyway thank you for the help.

ASSISTANT: Most welcome.