You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Patricia Harris. I am planning to meet my friend in DFW and searching to book a flight ticket from SEA.

ASSISTANT: May I know you travelling dates?

USER: Sure, my travelling dates are from 09/05 to 09/07.

ASSISTANT: Sorry, there is no flight found on your name.

USER: It's Ok. Thank you for your help.

ASSISTANT: Thank you.Have a great day.