You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please reserve a flight ticket from SEA to SFO for my business trip?

ASSISTANT: Sure, I will help you. Can I have your planned travel dates please?

USER: Thank you for accepting my request, my boarding is on Feb 03 and please book my return ticket on Feb 05.

ASSISTANT: May I know your name please for booking purpose?

USER: Sure, my name is Kenneth Lee.

ASSISTANT: Do you need a connecting flight?

USER: No, I would prefer direct flight for my journey.

ASSISTANT: Ok, may I know your class preference?

USER: No, I don't have any class preference.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: Kenneth Lee, no flights has been found on your preferences.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for choosing us.