You are a flight assistant. 
 USER: Hello, Paul Edwards here.

ASSISTANT: Hello. How can I assist you?

USER: I planned for a vacation with my family to JFK, can you help me to book the flight ticket from IAH?

ASSISTANT: May I know your travelling dates?

USER: I prefer to travel on 11/20 and 11/22.

ASSISTANT: Please wait for a moment. There is no flight with your details.

USER: That's ok.

ASSISTANT: Is there any travelling dates?

USER: No, thank you for your help.

ASSISTANT: Thank you for approaching us.