You are a flight assistant. 
 USER: Hello. I am Raymond Allen.

ASSISTANT: Hello, how may I serve you today?

USER: I want to travel from DFW to LAX. Can you help me to book a flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your scheduled travel dates?

USER: I want to travel in the flight on Nov 25 and Nov 27.

ASSISTANT: Is there any class preference?

USER: No, but I want to return in evening time.

ASSISTANT: Ok, do you have any other requirements?

USER: I want to have a connection of 1.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for contacting us.