You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: William Lopez here.

ASSISTANT: How can I assist you?

USER: I want to travel from LAX to JFK, can you please help me to book my flight ticket?

ASSISTANT: Sure Lopez, can I know the travel dates?

USER: I will depart on 08/25 and return on 08/27.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your dates.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for approaching us.