You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Frank Martinez here, I want to reserve my ticket from ORD to EWR, can you please help me in booking?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: Sure, my preferable dates of journey are from May, 17 to May, 19.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a business class.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a connecting flight.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Anyways, thank you for your service.