You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Betty Lee here.

ASSISTANT: How can I help you?

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

ASSISTANT: Yes, can you share me your travel dates?

USER: Sure, my planned dates are from 03/16 to 03/18.

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

USER: Ok, no problem.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your service.