You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you help me in booking a flight ticket from LAS to LAX?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel on 04/22, and return on 04/24.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: Any other preferences?

USER: I want to depart in the evening time.

ASSISTANT: Can you mention your name please?

USER: I am Sandra Lee.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for contacting us.