You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Shirley Green.

ASSISTANT: Thank you, may I know what type of help you need ?

USER: I want to book a ticket.

ASSISTANT: OK, could you please mention me your departure and arrival dates?

USER: It is from IAH to JFK.

ASSISTANT: When you want travel?

USER: And the dates are from 12/18 to 12/20.

ASSISTANT: Could please tell me is there any connection and price limit?

USER: Yes connection limit should be 1 and price limit should be 200.

ASSISTANT: OK fine,Please wait for a minute I will check is there any flight available.

USER: OK fine.

ASSISTANT: Sorry Shirley Green, cannot find any flights with your details.

USER: OK, thank you for your details.

ASSISTANT: Thank you , have a great day!.