You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I will help you. May I know your planned travel dates please?

USER: Sure, my planned travel dates are Apr 20 and Apr 22.

ASSISTANT: Can I have your name please?

USER: Myself Janet Phillips.

ASSISTANT: Do you need a connecting flight?

USER: Please look for a connecting flight.

ASSISTANT: May I know your airline preference?

USER: No, I'm not looking for any airline preferences.

ASSISTANT: Do you have any other specifications?

USER: I would like prefer business class for this journey.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Janet Phillips, no flights has been found on your planned travel dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.