You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I have a plan to celebrate my birthday party at Los Angeles. So, could you please help me by booking a flight ticket?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: June 25 and 27 are my planned travel dates.

ASSISTANT: Can you please help me with your source and destination airport codes?

USER: CLT and LAX are my depart and arrival airport codes.

ASSISTANT: Can I have your good name please?

USER: My name is Anthony King.

ASSISTANT: May I know your class and airline preference please?

USER: I can afford to fly in a economy class.

ASSISTANT: Please let me know if you have any other specifications.

USER: I wish to take rest in my trip.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's ok. Thank  you.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.