You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Katherine Perez want to book a ticket to EWR from SFO, can you please help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travel dates are from Dec 24 to Dec 26.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Ok, I will try with another airline. Thank you.

ASSISTANT: Welcome, have a great day.