You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Jones.

ASSISTANT: How may I assist you?

USER: Please help me in booking a flight ticket from IAD to LAX.

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

USER: My planned travel dates are Nov, 3 and Nov, 5.

ASSISTANT: Do you have any airline preference?

USER: I am comfortable with any airlines.

ASSISTANT: May I know your specific timings of your journey?

USER: My depart time should be at morning.

ASSISTANT: Do you need a connecting flight? Can I know your class preference?

USER: I am comfortable with any connection. I want to travel in business class.

ASSISTANT: Brenda Jones, no flights has been found on your planned travel dates.

USER: It's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.