You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you at this moment?

USER: I am Jessica Collins want to book a ticket to SFO from JFK, can you please help me out?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: My planned dates are from 01/12 to 01/14.

ASSISTANT: Do you prefer either economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any other preferences.

USER: I need a connecting flight.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: I am sorry to inform you that there is no flight available on given dates from you.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.