You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book a flight ticket from LAX to EWR?

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

USER: Thank you. I have planned my travel dates as Jan 31 and Feb 02.

ASSISTANT: Do you have any specifications?

USER: I would like to return in evening time so please check with that.

ASSISTANT: May I know your name?

USER: Sure, myself Margaret Allen.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that there were no flights found on your route.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.