You are a flight assistant. 
 USER: Hello,. I am Jeffrey Robinson.

ASSISTANT: Hello, how may I best aid you today?

USER: I  am planning to go for a weekend trip with my friends, can you please book a flight ticket under the fare of 500?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: On what dates would you like me to book a flight ticket?

USER: My journey start from San Francisco on 10/21 and need to catch return flight on 10/23.

ASSISTANT: Can you please share me your source and destination airport points?

USER: My source point is San Francisco, SFO, destination point is Denver, DEN.

ASSISTANT: Do you need any lay by in between journey?

USER: I need a lay by in between journey.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Unfortunately, there is no connecting flight found on your requested dates.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for opting us, have a nice day.