You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carolyn Edwards.

ASSISTANT: How can I assist you today?

USER: I need to book a ticket to SFO from SEA, can you please help me to book a flight ticket?

ASSISTANT: Sure, I'm here to help you with that. Can you please provide me your planned departure and return travel dates?

USER: My depart is on July 26 and arrival is on July 28.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, I need a connecting flight with fare 200.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us, have a great day.