You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Stephen Hernandez, want to travel from JFK to IAH. Please help me in booking my ticket.

ASSISTANT: Can I know your travel dates?

USER: Sure, my travelling dates will be from 03/16 to 03/18.

ASSISTANT: Sorry Hernandez, there is no flight available on your requested dates.

USER: It's ok, no issue. Thank you for your help.

ASSISTANT: You are welcome.