You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Melissa Green.

ASSISTANT: How may I guide you at this moment?

USER: As I am new to this booking process, will you help me in booking the flight ticket?

ASSISTANT: Sure, I am here to help you with this. Can you please provide your nearest airport codes of your journey?

USER: My nearest origin airport code is BOS and destination airport code is SFO.

ASSISTANT: May I know your planned dates of this journey please?

USER: My preferable journey dates are 03/31 and 04/02.

ASSISTANT: Wait a moment please.

USER: Ok, I will wait for your response.

ASSISTANT: Melissa Green, there are no flight services available on this route on your provided dates.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.