You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from CLT to SFO, can you help me with booking please?

ASSISTANT: Sure, please share your journey dates?

USER: Ok, my travelling dates are July 29 and July 31.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Is there any class preferences?

USER: No, I am comfortable with any class.

ASSISTANT: May I know your good name?

USER: Yes, my name is Matthew Hall.

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

USER: That's fine, thank you for the response.

ASSISTANT: Thank you for choosing us.