You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: This is Debra White.

ASSISTANT: What can I do for you?

USER: Could you please book a flight ticket for me?

ASSISTANT: Yes sure, let me know your source and destination details?

USER: My source code is MA - BOS and my destination code is PA - PHL.

ASSISTANT: Can you help me with your travelling dates?

USER: My travel dates are 08/15 and 08/17.

ASSISTANT: May I know your limits?

USER: My connection limit is 1 and price is 200.

ASSISTANT: Thank you White, but sorry to inform you there is no flight matches your details.

USER: That's OK. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.