You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I have a business meeting in San Francisco. Can you help me for booking a flight ticket from PHX to SFO?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My travelling dates are Apr 04 and Apr 06.

ASSISTANT: Do you have any specific timings of your journey?

USER: No.

ASSISTANT: Ok, please let me know the preferable connections too.

USER: I need a single connecting flight.

ASSISTANT: Are you looking for any specific class to travel?

USER: I prefer business class.

ASSISTANT: Ok, please let me know your good name to proceed further.

USER: My name is Alexander Garcia.

ASSISTANT: Please wait a moment to check availability of flight in your route.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Alexander Garcia, no business class flight is available to you on your dates due to all seats have filled.

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

ASSISTANT: Thank you for choosing us, have a good day.