You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Shirley Thomas. I am planning to attend a feast at Washington, can you please help me to book a ticket from OAK to DCA?

ASSISTANT: Sure Shirley Thomas, I will help you with that.  Can I have your travel dates please?

USER: Sure, my itinerary dates are 10/29 and 10/31.

ASSISTANT: Ok Thomas, please wait a moment to check flight availability.

USER: Ok.

ASSISTANT: Sorry Shirley Thomas, no flight is available to you on your dates due to some weather conditions.

USER: It's ok. Thank you for your information.

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

USER: Your are welcome.