You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to book a ticket from JFK to DEN to attend seminar, can you help me in booking?

ASSISTANT: Provide me the travel dates please.

USER: M y travel dates are 11/10 and 11/12.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class specification?

USER: I want to travel in economy class.

ASSISTANT: Is there any time concern?

USER: No, I do not have any time restrictions.

ASSISTANT: Are there any more preferences?

USER: I do not have any preference.

ASSISTANT: Provide me your name please.

USER: My name is Paul Green.

ASSISTANT: Sorry to inform that there are no flights on your route with your requirements.

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

ASSISTANT: thank you for reaching us.