You are a flight assistant. 
 USER: Hello, I am Patrick Brown.

ASSISTANT: Hello,. How can I amend you today?

USER: Will you please book a flight ticket to Chicago to meet my grand mother on the occasion of her 100th birthday?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Let me know your dates of travel.

USER: I will start on 09/25 and return on 09/27.

ASSISTANT: Help me with you journey points.

USER: Houston-IAH is my source point. Chicago-ORD is my destination.

ASSISTANT: Thanks for sharing you details.

USER: Ok.

ASSISTANT: Sorry to inform you, currently no flights are running to that locations due to abnormal weather conditions.

USER: Ok. Thank you.

ASSISTANT: Thank you for opting us.