You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Ruth Phillips, can you find a flight? I am planning for a holiday trip from DEN to OAK.

ASSISTANT: Yes, sure.please let me know your travelling dates?

USER: My travelling dates are 12/27 and 12/29.

ASSISTANT: Ruth Phillips, there is no flight on your preferable dates.

USER: That's fine for me, I will prefer another one. Thank you for your support.

ASSISTANT: Ok, thank you for contacting us.