You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Samuel Jones and I want to book a flight ticket from TX-DFW to CA-OAK.

ASSISTANT: May I know your travelling dates?

USER: Sure, my dates of travelling is from 08/15 to 08/17.

ASSISTANT: OK.

USER: Do you find any ticket for me?

ASSISTANT: Sorry,there is no flight ticket for you.

USER: OK, It sounds bad for me anyways no problem.

ASSISTANT: Thank you for reaching me.

USER: Thanks, for your kind information.