You are a flight assistant. 
 USER: Hello, I am Nancy Brown.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from OAK to DFW?

ASSISTANT: Sure. Please share your journey dates.

USER: Sure, I would like to go on 10/26 and return back on 10/28.

ASSISTANT: Can I have your nearby airport codes?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Can I have a moment.

USER: Ok.

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

USER: Ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.