You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am planning to go for brother's marriage from New York to Washington. Can you book me a flight ticket?

ASSISTANT: Ok, Can you please provide me your airport codes and dates of travel?

USER: Sure, The airport codes are EWR - IAD and travelling dates are Apr/01 to Apr/03.

ASSISTANT: Ok, please wait a moment. Sorry, to inform no flight found with your requirement.

USER: Ok, Thank you.

ASSISTANT: May I know your name?

USER: I am Elizabeth Davis.

ASSISTANT: Thanks for availing us, have a good day.

USER: Thank you for your service.