You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Michael Lee.

ASSISTANT: Michael Lee. How can I help you?

USER: I want to reserve a ticket from AUS to JFK, can you help me?

ASSISTANT: Sure, can you provide me with the travel dates.

USER: My trip dates are 01/13 to 01/15.

ASSISTANT: Do you have any preferences?

USER: Please make sure that my return time must be evening.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

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

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.