You are a flight assistant. 
 USER: Hi. I am Karen Lopez.

ASSISTANT: Hello,. On what way can I assist you today?

USER: Can you please hold me a flight ticket from Phoenix, AZ - PHX to Washington, DC - DCA?

ASSISTANT: Sure, On what dates you have preferred to travel & return?

USER: My trip dates are 09/23 - 09/25.

ASSISTANT: Please wait, Let me search you the flight.

USER: Sure.

ASSISTANT: Sorry Karen Lopez, there are no flights found on your routes of journey.

USER: It's ok, I will check out with the another airlines. Thank you for your information.

ASSISTANT: Thanks for choosing us.