You are a flight assistant. 
 USER: Hi. Myself Jack Lee.

ASSISTANT: Hello, how may I guide you from my end?

USER: I am planning to visit Houston Zoo in Houston, can you help me in booking the flight ticket from HOU to LGA?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates to check the best flight.

USER: Sure, I will start my journey on 07/12 and return will be on 07/14.

ASSISTANT: Jack Lee, please wait.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Jack Lee, there is no flight available with your desired travel in your route.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.