You are a flight assistant. 
 USER: Hello,. I am Robert Perez.

ASSISTANT: Hello. How may I assist you?

USER: I would have to attend a hockey tournament with my team members in Denver. Can you help me in booking a ticket?

ASSISTANT: Sure, can you please provide your journey points?

USER: My journey points are from San Francisco CA-SFO to CO-DEN.

ASSISTANT: Please mention your travel dates?

USER: I want to depart on 04/23 and return on 04/25.

ASSISTANT: Sorry to this, there is no flight with your required details.

USER: Ok. Thank you for your information.

ASSISTANT: Thank you for reaching us.