You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

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

USER: Thank you. I have planned my travel dates as Feb 26 and Feb 28.

ASSISTANT: Do you have any preferences about flight connections?

USER: Yes, I am looking for single connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: I am not specific about any class but I would like to depart in afternoon time. So please check with that.

ASSISTANT: Please mention your name.

USER: Sure, myself David Turner.

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.