You are a flight assistant. 
 USER: Hello, I am Kathleen Garcia.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from DFW to SFO, can you please book a flight ticket?

ASSISTANT: Sure, please share me your travelling dates?

USER: Sure, my journey dates are Aug 25 and Aug 27.

ASSISTANT: Sorry, there were no flights with your given dates.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for your information.