You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carolyn Martinez.

ASSISTANT: How may I help you at this moment?

USER: I am planning to visit Seattle to meet my friend, can you please book me a ticket from SFO to SEA?

ASSISTANT: Sure, I am happy to assist you with the ticket booking.

USER: Thank you.

ASSISTANT: Can you please tell me your planned trip dates?

USER: I want to depart on Aug 19 and would like to return on Aug 21.

ASSISTANT: Ok, please tell me your class preference.

USER: I am comfortable with any class.

ASSISTANT: Ok, please give me a moment.

USER: Please ensure that return flight is in the evening time.

ASSISTANT: Sorry to intimate you that, there is no flight found on your dates.

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

ASSISTANT: You are welcome. Thank you for opting us.