You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Virginia Martin from Oakland. Can you please help me to book a flight from OAK to SEA?

ASSISTANT: Sure, I am here to assist you in booking your flight ticket. Could you please let me know your trip dates?

USER: Sure, I would like to travel on Mar 22 and intend to return on Mar 24.

ASSISTANT: Ok, do you have any class preferences?

USER: No, I am comfortable with any class.

ASSISTANT: Ok, please wait for a while.

USER: Sure, please check with zero connection.

ASSISTANT: Sorry to inform your that there is no direct flight available on your preferred travel dates.

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

ASSISTANT: You are welcome and thank you choosing us.