You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Could you please book a ticket in business class to Detroit as I want to attend  a pioneer festival?

ASSISTANT: Sure, I will help you. Can I have your airport codes clearly?

USER: Sure, PHL and  DTW are my airport codes.

ASSISTANT: When would you like to plan your journey?

USER: I want to travel on 2nd Apr and return on 4th Apr.

ASSISTANT: Can I know your connection preference?

USER: I prefer a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Mary Adams.

ASSISTANT: Mary Adams, no flights has been found on your preferences.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for reaching us.