You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ronald White.

ASSISTANT: How can I serve you?

USER: Can you help me in booking on 03/03 to 03/05?

ASSISTANT: May I know your source and destination codes?

USER: My source is DCA and destination is LGA.

ASSISTANT: Sorry, there are no flights available on the dates to your region.

USER: No issue, thank you for checking.

ASSISTANT: It's my pleasure.