You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: Sure, my planned dates of journey are from Dec, 27 to Dec, 29.

ASSISTANT: May I know your good name?

USER: Sure, my name is Ruth Phillips.

ASSISTANT: Ok, do you have any other requirements?

USER: No.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

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

ASSISTANT: Thank you for approaching us.