You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Angela Davis. I am planning to travel on these days that is on May 22 and return on May 24. Can you make a reservation for me?

ASSISTANT: Sure, can you please mention with your respective airports codes of journey?

USER: Ok, my source code is from SEA and the destination is IAD.

ASSISTANT: May I know your airline preference please?

USER: I want a normal cost flight.

ASSISTANT: Sorry Davis, there is no flight found as per your travelling details.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: You are welcome.