You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Brian Young here, I want to reserve my ticket from BOS to AUS, can you please help me out?

ASSISTANT: Yes, I can help you. Can you share me your travelling dates?

USER: Sure, my planned dates of journey are from Sep, 22 to Sep, 24.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a return time at morning.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a business class.

ASSISTANT: Give me a moment.

USER: Sure, I will wait.

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

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for your service.