You are a flight assistant. 
 USER: Hello, Sharon Hernandez here.

ASSISTANT: Hello, how can I assist you?

USER: Can you book my ticker from PHL to EWR?

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

USER: From 08/04 to 08/06.

ASSISTANT: Wait a while, I will go through your details to check the flight availability. I am sorry to say that, there is no flight availability on the dates you have given.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us to help you.