You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please book a ticket from SFO to IAD? As I need to attend a wedding.

ASSISTANT: Please let me know your travelling dates?

USER: Sure, my planned departure and return travel dates are 12th and 14th of April.

ASSISTANT: May I know your connection limit?

USER: Yes, my maximum connection has to be 1.

ASSISTANT: Do you have any class preference?

USER: Yes, I prefer business class.

ASSISTANT: May I know your name?

USER: My name is Nancy Parker.

ASSISTANT: Do you have any other preference?

USER: Yes, I want to return in the afternoon time.

ASSISTANT: Sorry, no flights found on your route with your requirements.

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

ASSISTANT: Thank you for connecting with us.