You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Alexander White. I want to travel from LAX to LGA, can you please look after my booking part?

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

USER: I will be travelling on May 19th and 21st.

ASSISTANT: Is there any class preference for you?

USER: No, I don't have any class preference.

ASSISTANT: Do you have any specifications?

USER: I want to return back in the evening.

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

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.