You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Barbara Lewis here, I want to reserve my ticket from LAS to EWR, can you please help me?

ASSISTANT: I would be happy to help you with that, can you please share your preferable journey dates?

USER: Sure, my willing to travel dates are from 12/30 to 01/01.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: Barbara Lewis, I am sorry to say that there is no flight found under your details.

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

ASSISTANT: Thank you for reaching us, have a great day.