You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Young.

ASSISTANT: How can I help you now?

USER: Can you please book a connecting flight to attend a wedding?

ASSISTANT: Sure, may I know your travel please?

USER: I want to travel on dates 10/21 and 10/23.

ASSISTANT: May I know your airport codes please?

USER:     My airport codes are DEN and LAX.

ASSISTANT: Do you have any class preference?

USER: No, I am ok with any class.

ASSISTANT: May I know about your departure and arrival timings?

USER: I want to depart at evening and return in the morning.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no flights are running on your routes.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.