You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have to explore global nature in DCA. Could you please help me to book a ticket from IAH?

ASSISTANT: Sure, I am happy to help you. Can you please provide your travelling dates?

USER: 08/25 to 08/27.

ASSISTANT: Ok, May I know your name?

USER: Kathleen Roberts.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for being patient, No flights were available with your given details.

USER: Please provide flight details. Sorry, not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching our agency.