You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Barbara Moore.

ASSISTANT: How may I help you?

USER: I am looking for a flight from SFO to BOS, can you help me in booking the flight ticket?

ASSISTANT: I am here to help you, when you are willing to travel?

USER: Sure, my planned travel dates are 03/28 and 03/30.

ASSISTANT: Give me a minute.

USER: Ok, I will wait for your response.

ASSISTANT: There is no flight for you on your preferable dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for choosing us.