You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Martinez.

ASSISTANT: How may I assist you?

USER: I would like to travel from LAX to OAK. Can you please help me to book a ticket?

ASSISTANT: Sure, I am here  help you out. May I know your travelling dates please?

USER: I want to start on July 7 and return on July 9.

ASSISTANT: Do you have any specifications?

USER: yes, I need a connecting flight. My depart time should be afternoon.

ASSISTANT: Wait a moment please, let me check with that.

USER: Sure.

ASSISTANT: Karen Martinez, there are no flights available in you route.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.