You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I amend you today?

USER: Please book a ticket from Washington DC-DCA to Houston, TX-HOU.

ASSISTANT: Sure, may I have your travel dates?

USER: Departure date is 06/04 and 06/06 is return date.

ASSISTANT: What is your name please?

USER: I am Carolyn Rodriguez.

ASSISTANT: Thanks for sharing your details, but no flights found in search.

USER: Thank you.

ASSISTANT: Thank you.