You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you for the day?

USER: Myself Barbara Martinez. I am looking for a flight from DFW to SFO, can you help me in booking the flight ticket?

ASSISTANT:  Sure, I will help you with that. Can you please provide me your journey dates?

USER: Sure, my travel dates are 12/11 and 12/13.

ASSISTANT: I am very sorry to say, there are no flights found on your route as per your travel dates.

USER: That's ok, thank you for the information.

ASSISTANT: Barbara Martinez, thank you for choosing our agency. Have a great day.