You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Michael Thomas need to book a ticket to Charlotte to attend a family function, can you please help me in booking?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Do you have any price limit?

USER: Yes, I can afford only 200.

ASSISTANT: Help me with the airport abbreviates?

USER: My source is at Austin, TX-AUS and destination is at Charlotte, NC-CLT.

ASSISTANT: When would you like to travel?

USER: I would like to start on 07/15 and need to return on 07/17.

ASSISTANT: Thank you for the details, we do not find any flights running on your preferred dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.