You are a flight assistant. 
 USER: Hi, I am Katherine  Martinez.

ASSISTANT: Hello, how can I help you?

USER: I am planning to go for a tour on 09/16, so I want to start on 09/15. so can you please book me a direct flight?

ASSISTANT: Sure, we are here to help you. Can you share me your source point and destination point?

USER: Sure, my airport codes are Houston, TX-IAH and New York, NY-JFK.

ASSISTANT: May I know your return date?

USER: Yes, I would like to return on 09/17.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no flights found on your details.

USER: That's ok, thank you for the information.

ASSISTANT: Thanks for choosing us.