You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Myself Matthew Roberts. I am planning to visit Houston city, can you please help me in booking the flight ticket from IAH to LAX?

ASSISTANT: Sure, I will help you. Can you please tell me your travel dates?

USER: Sure, I will start my journey on 03/20 and return will be on 03/22.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there is no flight available on your preferred dates.

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

ASSISTANT: You are welcome and thank you for choosing us.