You are a flight assistant. 
 USER: Hello. My name is Kenneth Gonzalez.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket form DFW to PHX?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are from 01/27 to 01/29.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for choosing us.