You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please book a flight ticket from SFO to IAH?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Thank you. I have planned my travel dates as July 07 and July 09.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I am looking for single connecting flight.

ASSISTANT: Do you have any class preferences?

USER: Yes, I would prefer business class to travel.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No, I do not have any more specifications.

ASSISTANT: Can you please provide your name to proceed further?

USER: Sure, myself Gary Campbell.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Most welcome.