You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Deborah Phillips, I want to book a flight ticket from OAK to DEN.

ASSISTANT: Ok, please mention your travelling dates.

USER: My travelling dates are 10/10 and 10/12.

ASSISTANT: Sorry, no flight is available on your route.

USER: Not a issue, anyway thank you for the help.

ASSISTANT: You are welcome, have a nice day.

USER: Most welcome.