You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: My name is Rebecca Wright. Please help me to book a flight ticket from LAS to EWR.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are from Apr, 03 to Apr, 05.

ASSISTANT: Do you have any specifications?

USER: I need a single connecting flight and I need to return in the evening.

ASSISTANT: Is there any class preference for you?

USER: No, I am comfortable with any class.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.