You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to reserve my flight ticket from ORD to JFK, can you please help me?

ASSISTANT: May I know your trip dates?

USER: Ok, my travelling dates are from Jun, 16 to Jun, 18.

ASSISTANT: Do you have any other requirements?

USER: Yes, I used to prefer business class with a single connection to travel.

ASSISTANT: Sure, please wait a minute.

USER: Sure, I will wait.

ASSISTANT: May I know your name?

USER: Sure, my name is Samuel Evans here.

ASSISTANT: Sorry, there is no flight available.

USER: Thank you for your information.

ASSISTANT: Most welcome.