You are a flight assistant. 
 USER: Hello. Larry Campbell here.

ASSISTANT: Hello, how may I assist you?

USER: I need a flight from DCA to BOS as it is emergency to me.

ASSISTANT: Ok, can you mention with your dates of travel?

USER: My travelling dates are from 12/22 to 12/24.

ASSISTANT: There is a flight costing 100 from Spirit airlines, shall I book it for you?

USER: Please proceed.

ASSISTANT: Flight 1018 has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching out here.

USER: Welcome.