You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit a NASA space center in Houston, so please book a flight ticket from JFK to HOU.

ASSISTANT: Sure, let me know your travelling dates?

USER: I will start on May 20, return on May 22.

ASSISTANT: Do you have any connection limit?

USER: I want direct flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Can I know your good name?

USER: My name is Edward Wilson.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.