You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I would like to book a flight ticket from EWR to PHL for meeting my friend, can you help me with that?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: My trip dates are 11/22 and 11/24.

ASSISTANT: Do you have any class preference?

USER: I need a connecting flight in business class.

ASSISTANT: Is there any specifications?

USER: My return time must be in evening.

ASSISTANT: May I know your name please?

USER: I am Donna Carter.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you.