You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking a flight ticket from Denver, DEN to Dallas, DFW?

ASSISTANT: Sure, can you mention your travel dates?

USER: My journey dates are from May 22 to May 24.

ASSISTANT: Do you need any connections?

USER: I need a stopover in between journey.

ASSISTANT: Are there any other preferences?

USER: My depart time is afternoon.

ASSISTANT: May I know your name?

USER: My name is Richard Nelson.

ASSISTANT: Sorry, there is no flight found under your details.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.