You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at today?

USER: I would like to meet my friend at Los Angeles, can you please help me to reserve my flight ticket from LAX to IAH?

ASSISTANT: Ok, I will help you with that. Can I know your travelling dates?

USER: Ok, my travelling dates are 10/10 and 10/12.

ASSISTANT: Ok, do you have any other requirements?

USER: Yes, flight has to be with a single connection.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, I need to travel by economy class preference.

ASSISTANT: Ok, wait for a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, not an issue.

ASSISTANT:  May I know your name?

USER: Sure, my name is Patricia Johnson here.

ASSISTANT: Thank you for approaching us.

USER:  Thank you for your information.