Hello.
user
Hello, how can I help you?
assistant
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.
user
Sure, may know your name?
assistant
My name is John Scott.
user
Ok, could you provide me your  travelling dates?
assistant
I am boarding on 10/03 and returning on 10/05.
user
Ok, wait for a minute.
assistant
Ok.
user
Sorry Scott, no flight's available on your request.
assistant
Oh! it's ok, thank you for searching.
user
Thank you for reaching us.
assistant