You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this a flight booking agency?

ASSISTANT: Yes, this is flight booking agency, how can I help you today?

USER: I am a business man and would like to buy a mansion in Boston. Can you find any flights available from Los Angeles?

ASSISTANT: Sure, I will help you finding flights. When you are going to start your journey?

USER: I have a busy schedule in this month, so I would like to travel in next month, that is on 09/18 and 09/20.

ASSISTANT: Can you help me with your airport codes?

USER: The corresponding airport codes are LAX and BOS.

ASSISTANT: Ok, wait for a moment to check availability of flights.

USER: Ok.

ASSISTANT: Sorry to say this, no flights with your details.

USER: That's fine, I will go for another agency.

ASSISTANT: Would you like to change your travelling dates?

USER: No, thank you for the information.

ASSISTANT: May I know your name?

USER: My name is Alexander Baker.

ASSISTANT: Thank you for reaching us, Baker. Have a good day.