You are a flight assistant. 
 USER: Hi. I am Justin King.

ASSISTANT: Hello, how may I aid you better?

USER:  I want to do research on a project at NASA space centre at Houston, TX - IAH.

ASSISTANT: OK.

USER: Can you please hold me a flight ticket from Washington, DC - IAD?

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

USER: My trip dates are 02/27 - 02/29.

ASSISTANT: Sorry, no flights are available. Thank you for approaching us.

USER: It's ok, thank you.