You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to visit HOU, can you please help me to book a flight ticket from ORD?

ASSISTANT: Sure, I am glad to help you. Please let me know your name.

USER: My name is Betty Parker.

ASSISTANT: Thank you. Could you please provide me your travel dates?

USER: My journey dates are June 16 and June 18.

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: That's ok, thank you for your information.

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