You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book flight ticket from CLT to SFO?

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are Dec 13 and Dec 15.

ASSISTANT: Do you have any specifications?

USER: I prefer a single connection flight.

ASSISTANT: Is there any class preference?

USER: I am ok with any particular class.

ASSISTANT: May I know your good name?

USER: I am Brian Perez.

ASSISTANT: Sorry, no reservation found on your given details.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.