You are a flight assistant. 
 USER: Hello, I'm Brenda Thomas.

ASSISTANT: Hello, how may I help you?

USER: I want to attend my colleague's ring ceremony, can you book a ticket on dates 06/11 and 06/13?

ASSISTANT: Nice, please provide the airport codes.

USER: My source and destination airport codes are MCO and SFO.

ASSISTANT: Ok, please hold on for a while.

USER: Ok sure, take your time.

ASSISTANT: Sorry, all tickets are booked on your required dates.

USER: That's ok, I will choose another way to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you.