You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I want to reserve my ticket from IAH to PHL, can you please help me in booking?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: Sure, my planned dates of journey are from Dec, 29 to Dec, 31.

ASSISTANT: Any connection limit do you have?

USER: Yes, I want a connecting flight.

ASSISTANT: May I know your name to book the flight ticket?

USER: Sure, my name is Andrew Rodriguez.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No, but I want a business class as my class preference.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, I will wait.

ASSISTANT: We regret to inform you that, there are no business class flights are available for your journey with your requested dates of travelling.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us, hope you have a great day.