You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: Virginia Johnson here.

ASSISTANT: How can I assist you?

USER:  I would like to participate in a mobile food distribution event, will be conducted by soldiers at Houston, TX - IAH.

ASSISTANT: Ok, may I know your travelling dates?

USER: Can you help me in reserving a flight ticket with a direct flight? Sure, I want to start on 04/21 and return on 04/23.

ASSISTANT: Ok, please let me know your source code?

USER: My source is San Francisco, CA - SFO.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Here is a flight ticket with fare 100 and 1003 as flight number.

USER: That's perfect, go on with booking.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thanks for your assistance.