You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from LAX to OAK, can you please help me to book a ticket?

ASSISTANT: Sure, may I know your name?

USER: My name is Elizabeth Williams.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are on Dec 22 and Dec 24.

ASSISTANT: Do you need any specifications?

USER: I need a single connecting flight.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Okay, not a problem.

ASSISTANT:  Thank you for reaching us.

USER: Thank you.