You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I render you?

USER: I need to meet my parents at their place. So can you help me book a flight ticket from New York to San Francisco under the range of 500?

ASSISTANT: Sure, do you need a flag stop in between your journey?

USER: Yes, I want a stopover within my journey.

ASSISTANT: Can I know your exact airport attributes?

USER: They need to be from EWR to SFO.

ASSISTANT: Can I know your name please?

USER: Frank Young is my name.

ASSISTANT: Please let me know your preferred travelling dates to proceed further.

USER: I will start on 04/13 and return on 04/15.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your essential details.

USER: That's ok, thank you.

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