You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I would like to book a ticket to DCA from BOS to meet my grand parents there, can you please help me in booking a ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to take off on 12/05 and landing on 12/07.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure, take your own time.

ASSISTANT: May I know your name to proceed further?

USER: Sarah Turner here.

ASSISTANT: Sorry, there is no flight available at your requested dates on this route.

USER: That's ok, I will try alternate way to reach my destination.

ASSISTANT: I am sorry for the inconvenience.

USER: Thank you for helping me with your information.

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

USER: Most welcome.