You are a flight assistant. 
 USER: Hello, I am Michelle Lopez.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me to book a flight ticket within the fare limit 5000 to New York to visit NASA space center?

ASSISTANT: Sure, do you need a connection within your journey?

USER: I don't have any connection preference.

ASSISTANT: Could you please share your dates of journey?

USER: 04/18 and 04/20 are my planned travelling dates.

ASSISTANT: May I know your favourable journey airport codes?

USER: My plan to start from Denver, CO-DEN to reach New York, NY-JFK.

ASSISTANT: Thank you for providing your details.

USER: Ok.

ASSISTANT: There are no flights found according to your specifications.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.