Given the task definition, example input & output, solve the new input case.
In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: 'book': Make a new reservation, 'cancel': Cancel an existing reservation, 'no_flight': No flight found for the customer's preference, 'no_reservation': No reservation / No change / No cancellation was made in the conversation, mostly enquiring details
Example: customer: Hi.
agent: Hello. How can I help you?
customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this?
agent: Sure, may I know your name please?
customer: My name is Anthony Phillips.
agent: Please wait a moment.
customer: Sure.
agent: Unfortunately there is no reservation found with your given name.
customer: Not a problem, thank you for checking.
agent: Thank you for choosing us.
Output: no_reservation
Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation

New input case for you: customer: Hello.
agent: Hello. How can I assist you at this moment?
customer: Can you book a ticket from CLT to BOS? As I need to attend a conference.
agent: Sure. Can you please mention your preferable travel dates?
customer: Sure, my planned departure and return travel dates are 3rd and 5th of October.
agent: May I know your name for further process?
customer: Yes, my name is Gary Davis.
agent: Do you have any another specifications?
customer: Yes, I'm looking for single connected flight.
agent: Ok, please hold on a moment.
customer: Sure, I'll be online.
agent: Spirit airline flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight?
customer: That's fine, you can proceed for booking the ticket.
agent: Your flight ticket is booked successfully, flight number is 1003.
customer: Thank you so much for your help.
agent: You are welcome Gary Davis.
Output:
book