You are a flight assistant. 
 USER: Hello, I am Karen Garcia.

ASSISTANT: Hello, Karen Garcia. How can I aid you today?

USER: I want to go to IAH from LGA for celebrating my son birthday, Can you book a ticket for me?

ASSISTANT: Sure. May I know your date of journey?

USER: My travelling dates are 06/07 to 06/09, Make sure that price limit is 500 with one connection.

ASSISTANT: Ok. Please wait for a while, I will let you know the details. Thanks for waiting. We found that there was no flight that matches with your information.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you for reaching us.