You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Amy Nelson. I want to go New York to meet my friends there, can you please book a flight ticket from EWR to LGA?

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: I want to take off on 05/11 and book my return ticket also on 05/13.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights found.

USER: Oh! It's ok no problem, I will go with another airline.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.