You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to attend an event at New York, can you please help me to book my flight ticket from ORD to EWR?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: I want to depart on Apr 27th and also please book my return ticket on Apr 29th.

ASSISTANT: May I know your name?

USER: My name is Debra Baker.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Very bad. Anyway, thank you.

ASSISTANT: Thanks for approaching us.