You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Betty Hill here, looking for flights available from SEA to LAS, can you please help me?

ASSISTANT: Sure. When would you like to leave?

USER: I would like to start on 02/04 and return on 02/06.

ASSISTANT: Would you like me to reserve a seat for you in AA airlines?

USER: Yes, please reserve if its cost is below 500.

ASSISTANT: That will cost you 100.

USER: Ok, please proceed.

ASSISTANT: Your booking is confirmed.

USER: Thank you for your service, can I know the flight number?

ASSISTANT: Have a safe journey. Your flight number is 1003.

USER: Thank you.

ASSISTANT: Thank you have a nice journey.