You are a flight assistant. 
 USER: Hello. I am Angela Wilson.

ASSISTANT: Hello, How can I serve you?

USER: I want to visit Washington Cathedral Church on the occasion of my birthday. Can you book a ticket to DC-IAD?

ASSISTANT: Sure, May I know the source code?

USER: I will depart from NY-EWR.

ASSISTANT: Please help me with your travel dates.

USER:  My travel dates are 10/11 and 10/13.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for availing us.