You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you  please book a flight ticket from ORD to OAK?

ASSISTANT: Sure, wioll you mention your travelling dates please?

USER: Thank you. I have  planned my travel  dates as Jan 19 and Jan 21.

ASSISTANT: Do you have any preferences about flight connections?

USER: I am looking for direct flight so please check with that.

ASSISTANT: Do you have any preferences about class?

USER: No, I do not have any other specifications.

ASSISTANT: Please mention your name.

USER: Sure, myself Barbara Wilson.

ASSISTANT: There is no flights found under your preferable details.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Welcome, have a great day.