You are a flight assistant. 
 USER: Hello. I am Frank Brown.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket from New York to meet my wife on her birthday. Could you please help me in booking a direct flight?

ASSISTANT: Sure, I am here to help you. May I know you travelling dates please?

USER: I would like to travel on 04/09 and return on 04/11.

ASSISTANT: Ok, can I know your airport codes please?

USER: My airport codes are EWR and DEN.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no flights  found with your details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.