You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit The American Museum of Natural History in New York, as I am very much interested to know more about the history. So please search a flight from IAD to LGA.

ASSISTANT: Sure, may know your name?

USER: My name is John Scott.

ASSISTANT: Ok, could you provide me your  travelling dates?

USER: I am boarding on 10/03 and returning on 10/05.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: Sorry Scott, no flight's available on your request.

USER: Oh! it's ok, thank you for searching.

ASSISTANT: Thank you for reaching us.