You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can  you  please book a flight ticket from SEA to JFK?

ASSISTANT: Sure, please share your journey dates?

USER: Thank you. I have planned my travel  dates as Jan 20 and Jan 22.

ASSISTANT: Do you have any specifications?

USER: I would prefer normal cost airlines only so please make sure that.

ASSISTANT: Is there any class preference?

USER: No but I would like to return in afternoon time so please check with that.

ASSISTANT: May I know your good name?

USER: Sure, myself John Anderson.

ASSISTANT: Sorry, no flights found on your given details.

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

ASSISTANT: Thank you for choosing us.

USER: Most welcome.