You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Green.

ASSISTANT: How may I assist you today?

USER: I would like to depart in the morning from LGA, can you help me with booking ticket to IAD?

ASSISTANT: Sure, can I know your trip dates?

USER: Ok, my planned dates should be from Nov 18 to 20.

ASSISTANT: Do you prefer economy or business class?

USER: Yes, I would like to go with the business class.

ASSISTANT: Do you need a stopover?

USER: Yes.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, we didn't find any flights on your required details.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.