You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you today?

USER: I want to book a connecting flight from LGA to LAS. Can you please help me with the booking?

ASSISTANT: Can you please let me know your travelling dates?

USER: Sure, I want to travel on Sept 16 and need to return on Sept 18.

ASSISTANT: Do you have any class preference?

USER: Yes, I prefer an economy class.

ASSISTANT: May I know your name?

USER: I am Emily Thompson.

ASSISTANT: Is there any other specifications for your journey?

USER: My return time must be in the morning.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Emily Thompson, based on your requirements we haven't found any flights in airline database.

USER: Ok, no problem.

ASSISTANT: Thanks for approaching us.

USER: Thank you for the information.