You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I am Mary Taylor want to book a ticket to Houston to go for a Grand Canyon Adventure so, can you please avail a ticket for me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: I want to fly out on 02/29 and return on 03/02.

ASSISTANT: Help me with your source and destination code.

USER: My source is Detroit, MI-DTW and destination is Houston, TX-IAH.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Sorry, currently there are no flights to your destination.

USER: No problem, I will try with another airline. Thank you.

ASSISTANT: Ok, thank you for opting us.