You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: Can you help me in booking a flight ticket from SFO to LAX?

ASSISTANT: Sure, will you please let me know your travel dates?

USER: I want to travel on 12/19, and return on 12/21.

ASSISTANT: Do you need an economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: How many connections do you need?

USER: I need a single connection.

ASSISTANT: At what time will you return and depart?

USER: I am comfortable with any time.

ASSISTANT: Will you be comfortable in a low cost airline or you need a normal cost airline?

USER: I prefer for normal cost airline.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Susan Scott.

ASSISTANT: Ok Susan Scott, thanks for being patient. We regret to inform that there are no flights going on your way at this moment.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for approaching us. We hope to serve you better in future.