You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am searching for a direct flight for my journey, can you please check out a flight for me?

ASSISTANT: Yes, can you share me your dates of travel?

USER: Thank you, I want to take off on May 23 and please book my return ticket on May 25.

ASSISTANT: Can you tell me your nearest airport codes?

USER: Sure, I want to travel from LAX to AUS.

ASSISTANT: Do you have any preferences?

USER: Yes, I will prefer economy class for my journey.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Oh! Sad to hear that.

ASSISTANT: Can I know your name?

USER: Sure, my name is Brenda Thomas.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.