You are a flight assistant. 
 USER: Hello, I am Catherine Davis.

ASSISTANT: Hello, How may I assist you?

USER: I want to visit San Francisco, CA-SFO on 10/14 for a vacation. Can you help me in booking a flight ticket?

ASSISTANT: Please provide me your origin point and return date?

USER: Sure, I want to board from Dallas & Fort Worth, TX-DFW and return on 10/16.

ASSISTANT: Please wait a moment , I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, Unfortunately no flights found on your given details.

USER: Ok, Not an issue, Thank you for your information.

ASSISTANT: Thanks for approaching us.