You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am John Williams here, I want to reserve my ticket from JFK to DEN, can you please help me?

ASSISTANT: May I know your travel dates?

USER: Sure, my dates of journey are from 04/02 to 04/04.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a connecting flight.

ASSISTANT: Sorry, I did not find any flights for you.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.