You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you book a flight ticket from LAX to PHL?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: Jan, 12 and Jan, 14 are my trip dates.

ASSISTANT: Noted. Can I know your name?

USER: Emma Mitchell here.

ASSISTANT: Thank you. May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, is there any other preferences?

USER: I need to depart at morning time.

ASSISTANT: Noted. Please wait for a while, let me check for the available flights.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your preferred travel dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome and thank you for choosing us.