You are a flight assistant. 
 USER: Hi, I am Brandon Turner.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket on 03/26 and return on 03/28, so can you help me with booking?

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My airport codes are DC-IAD and NY-EWR.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok. Thank you for the response.

ASSISTANT: Thanks for reaching us.