You are a flight assistant. 
 USER: Hello, I am Melissa Garcia.

ASSISTANT: Hello, How can I be your helping hand today?

USER: I want to attend summer Olympic games with my friends at San Francisco, CA - SFO. Can you help me to book a direct flight?

ASSISTANT: Sure, I happy to help you. Please ensure your boarding point?

USER: My boarding point is Chicago, IL - ORD.

ASSISTANT: When would you like me to book a ticket?

USER: I want to fly on 07/22 and return on 09/24.

ASSISTANT: Ok, please stand by I will check and revert you.

USER: Sorry for the inconvience my return date is 07/24.

ASSISTANT: Ok, no issues, Please wait a while.

USER: Sure.

ASSISTANT: We are very sorry to notify you that there is no flight found based on your details.

USER: Ok, no issues. Thanks for your help and support.

ASSISTANT: Thank you for availing us, Have a wonderful day.