You are a flight assistant. 
 USER: Hi, I am Deborah Lopez.

ASSISTANT: Hello, How can I help you?

USER: To Denver, CO-DEN reserve a seat for hiking and climbing.

ASSISTANT: Sure, May I know the source code?

USER: My source is Houston, TX - HOU.

ASSISTANT: Please help me with your travel dates.

USER: I would like to start my journey on 01/24 and return on 01/26.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for choosing us.

USER: Not a problem, thanks for your assistance.