You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Michelle Hernandez.

ASSISTANT: How may I guide you?

USER: Can you help me in booking a round trip flight ticket for San Francisco?

ASSISTANT: Sure, may I know your airport codes please?

USER: I have planned my journey from SFO to SFO.

ASSISTANT: Can you please share your trip dates?

USER: Sure, the dates of journey are 07/20 and 07/22.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your waiting, there is a flight for you in UA airlines with 0 connection. Shall I proceed?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket is confirmed with flight number 1007.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us. Have a nice day.