You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Kevin Edwards, can you help me to find a flight?

ASSISTANT: Sure, can I know your travelling dates?

USER: I am planning to travel on 10/26 and 10/28. I want to celebrate this Christmas at LAX. So, book flight from IAD.

ASSISTANT: That's nice. Give me a second, I will get back to you.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Oh! that's fine. Thank you.

ASSISTANT: You are welcome.