You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me to book a business class ticket for my trip?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Raymond Robinson.

ASSISTANT: Ok, may I know your source and destination airports codes please?

USER: My travelling airport codes are DEN and PHX.

ASSISTANT: Ok, may I know your travelling dates of journey please?

USER: My travelling dates are Sept 16 and 18.

ASSISTANT: Ok, what is your connection limit?

USER: I am fine with any connection.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Robinson, there is no flight available as per your travelling details.

USER: No issues, thank you for your time.

ASSISTANT: You are welcome.