You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to attend a meeting, can you please book the ticket from ORD to SFO?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, I would like to depart from my source location on 4th Nov and I want to return back by 6th Nov.

ASSISTANT: Do you have any specifications?

USER: I prefer single connected flight.

ASSISTANT: Is there any class preference?

USER: I'm ok with any class.

ASSISTANT: May I know your good name?

USER: My name is Christopher Garcia.

ASSISTANT: Sorry, no flights found on your given details.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for choosing us.