You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency.

USER: My name is Patrick Collins.

ASSISTANT: How may I help you, Collins?

USER: I would like to visit the San Francisco Zoo. Can you help me in booking a ticket?

ASSISTANT: Definitely, may I know your source and destination airport codes please?

USER: I am planning my journey from HOU to SFO.

ASSISTANT: Can I know on which dates are you planning to travel?

USER: My journey dates would be 12/31 and 01/02.

ASSISTANT: There is a flight available on those dates from Delta airline with the ticket fare of 200, is that ok for you?

USER: Sure, please book the ticket.

ASSISTANT: I have successfully booked your ticket with flight-1013, have a happy journey.

USER: Thank you for your service.

ASSISTANT: My pleasure, thank you so much for choosing us.