You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Debra Perez here.

ASSISTANT: How may I help you today?

USER: I would like to visit San Francisco for my vacation, can you please help me to book a flight to go there?

ASSISTANT: Ok, can I have your travelling dates please?

USER: Sure, my boarding is on 07/31 and please book return ticket on 08/02.

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

USER: I want to travel from HOU to SFO.

ASSISTANT: Yes, I found a flight with Delta airlines, can I proceed?

USER: If it is single connected, you can proceed with booking.

ASSISTANT: Yes Perez, your ticket is confirmed with the flight number 1007.

USER: Thank you for your assistance.

ASSISTANT: Thank you for contacting us, have  a safe journey.

USER: Welcome.