You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Amy Williams here. I am planning to visit my friend's house in San Francisco, can you book a flight from Orlando?

ASSISTANT:  Sure, could you please share your travelling dates?

USER: I will start my journey on 09/28 and return will be on 09/30.

ASSISTANT: May I know your airport codes?

USER: My source airport code is MCO and my destination  airport code is SFO.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flight available on that dates.

USER: Thats ok, I will find another source to complete my trip.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you for assisting me.