You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking for a flight from EWR to DEN, can you please help me in booking?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travelling dates are July 20 and July 22.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, may I know your class preference?

USER: I prefer economy class.

ASSISTANT: Ok, please provide me your name.

USER: Sure, my name is Cynthia Scott.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.