You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from SFO to LAX, can you please help me in booking?

ASSISTANT: Sure, I can do that for you. Please let me know your name.

USER: Sure, my name is Katherine Hall.

ASSISTANT: Thank you. Please tell us your travel dates.

USER: My travelling dates are Mar 22 and Mar 24.

ASSISTANT: Thank you. Please tell us your class preference.

USER: I am fine with any class.

ASSISTANT: Ok, please stay online for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your preferred travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome and thank you for approaching us.