You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Margaret Smith, I want to book a ticket from SFO to LGA. Can you book a direct flight?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Let me know when you are willing to travel?

USER: I will depart on 05/23 and return on 05/25.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Ok, thank you for informing me.

ASSISTANT: Thanks for approaching us.