You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Martinez here.

ASSISTANT: Nancy, how can I assist you?

USER: I want to meet my mother-in-law, could you book my ticket from LGA to CLT?

ASSISTANT: Sure, can you please provide me your travel dates?

USER: My itinerary dates are 12/18 and 12/20.

ASSISTANT: Sorry, no flight available on your preferred dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us and have a nice day.