You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Amy Adams. I would like to meet my friend at Houston. Can you reserve me a flight ticket in economy class?

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, my planned journey dates are May 06 and May 08.

ASSISTANT: May I know your journey airport codes?

USER: I am planning to leave from AUS to reach IAH.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no economy class available on your given dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.