You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how can I assist you now?

USER: Gregory Lee here. I need to book a ticket from IAH to JFK, can you help me?

ASSISTANT: Sure, please notify me your travelling dates.

USER: My trip dates are 04/29 to 05/01.

ASSISTANT: Do you need any other specifications?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no flight found on your requested dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thanks for approaching us.