You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to reserve my ticket from IAD to LGA, can you please help me to book a ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Do you prefer a halt in between your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your scheduled travel dates?

USER: Sure, my preferable dates of journey are from Aug, 30 to Sep, 01.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, there are no flights found from your source.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: May I know your good name?

USER: Sure, my name is Mark Wilson.

ASSISTANT: Thank you, have a good day.

USER: Welcome.