You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Katherine Adams.

ASSISTANT: Ok.

USER: I would like to travel from HOU to DCA. Can you please help me to book a ticket?

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

USER: My travelling dates will be on 03/04 to 03/06.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Katherine Adams, no flights found on your requested travelling dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.