You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: I want to book a ticket from EWR to SFO, could you please help me to book a ticket?

ASSISTANT: Sure, will you please let me know your name first?

USER: My name is Michael Nelson.

ASSISTANT: Ok Michael Nelson, Can you please forward your trip dates as well so that I can find a better flight for you?

USER: Sure, My trip dates are on July 15 and July 17.

ASSISTANT: Would you like to travel in a major cost airlines like UA, AA and Delta or low cost airline is okay for you?

USER: I am looking for best airline which you have.

ASSISTANT: May I know which class would you prefer to travel in?

USER: I am okay to travel in any class.

ASSISTANT: Ok Michael Nelson, Please allow me a moment to check the availability of flights and get back to you.

USER: Sure.

ASSISTANT: Thanks for be patient, We regret to inform that there are no flights available at this moment according to your required essentials.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for consulting us. We hope to serve you better in future.