You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Virginia Campbell.

ASSISTANT: How may I assist you?

USER: I am planning for a trip from BOS to DCA, can you help me?

ASSISTANT: Sure, may I know your travelling dates please?

USER: Sure, my journey dates are 09/22 and 09/24.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your preferable dates.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for approaching us.