You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Melissa Roberts. Can you help me in booking a ticket from LGA to LAS?

ASSISTANT: Sure, can I know your travelling dates?

USER: My planning dates are from 10/08 to 10/10.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us.