You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am George Rodriguez. Can you please book a flight ticket from EWR to JFK?

ASSISTANT: Sure, on which dates you are planning to travel?

USER: Sure, I need to travel on dates of 01/18 and 01/20.

ASSISTANT: Sorry, on these dates there is no flights available.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Most welcome.