You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Rachel Jones.

ASSISTANT: How can I help you now?

USER: Suddenly there is a trip to Houston to start my new company, could you book a ticket for me?

ASSISTANT: Sure Jones, I am happy to help you. Let me know your travel dates please.

USER: It will be suitable for me. SO, my dates would be 10/28 and returns on 10/30.

ASSISTANT: May I know airport codes please?

USER: Currently I am staying in LAX and I want to move to IAH.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Jones, no flight has found.

USER: Oh! It's not good to me. But, anyway thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.