You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Shirley Mitchell here, I want to reserve my ticket from LAS to JFK, can you please help me?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my preferable dates of journey are from Feb, 21 to Feb, 23.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a depart time at afternoon.

ASSISTANT: May I know your class preference?

USER: No, I need a connecting flight.

ASSISTANT: Ok, wait a minute.

USER: Sure, I will wait.

ASSISTANT: There is no flight available on your travelling dates.

USER: Ok, that's fine. Thank you for your service.

ASSISTANT: Thank you for reaching us.