You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Gonzalez.

ASSISTANT: How may I aid you?

USER: I want to book a ticket from JFK to IAH.Can you please help me out to book a ticket?

ASSISTANT: Please can I know your travel dates?

USER: I am planning to travel on 06/17 and 06/19.

ASSISTANT: Sorry David, there is no flight found basis on your details.

USER: That's fine, thank you fro your help.

ASSISTANT: Most welcome.