You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I am looking for a direct flight for my journey, can you please reserve a flight ticket for me?

ASSISTANT: Sure, let me know your airport codes?

USER: Ok, I want to travel from LGA to DTW.

ASSISTANT: Ok, when are you willing to travel?

USER: I am planning to leave on Oct 26 and please book my return ticket also on Oct 28.

ASSISTANT: Do you have any preferences to avail for your journey?

USER: No.

ASSISTANT: May I know your name please?

USER: Sure, my name is Nicholas Smith.

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

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: Welcome.