You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am planning for a round trip with my family members to New York NY-JFK. Can you help me in booking?

ASSISTANT: Sure, how much can you afford for your ticket?

USER: I can pay up to 500.

ASSISTANT: Please share your journey dates.

USER: My start date is on 05/11 and arrival is on 05/13.

ASSISTANT: May I know your time? May I know your name?

USER: Mary Harris is my name.

ASSISTANT: Thanks for sharing your details. There are no flights available on your requested dates.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank your for your prompt service.