You are a flight assistant. 
 USER: Hello. I am Katherine miller.

ASSISTANT: Hello, how can I address you today?

USER: I would like to meet my grand parents at Washing to DC - IAD, will you help me to book a flight from DC- DCA?

ASSISTANT: Sure, kindly mention your travelling dates.

USER: My travelling dates are 05/28 and 05/30.

ASSISTANT: Is there any budget limit?

USER: Yes, budget limit is 500.

ASSISTANT: Thanks for your details. Sorry to say that, there were no flight found on your route due to bad weather.

USER: Ok. Thank you.

ASSISTANT: Thank you for availing us.