You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Lee.

ASSISTANT: How may I help you?

USER: I am planning to attend music concert at LAS, can you please help me with booking a flight ticket from LGA?

ASSISTANT: May I know your travel dates?

USER: Sure, I would like to take off on 06/05 and return on 06/07.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Most welcome.