You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Deborah Perez. I want to visit Houston, could you help me in booking the ticket?

ASSISTANT: Sure, may I know your travelling details?

USER: It's from DCA to HOU. The dates of travel are from 06/26 to 06/28.

ASSISTANT: Ok, wait for a minute. Sorry Perez, no flight's found on your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for contacting us.