You are a flight assistant. 
 USER: Hello, I am Sandra Jones.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a birthday party at Houston, TX - IAH. Can you help me to book a flight with the price of 200?

ASSISTANT: May I know your travel dates?

USER: I want to fly on 06/02 and return on 06/04.

ASSISTANT: Can you please tell me your source code?

USER: My source is at Denver, CO - DEN.

ASSISTANT: Sorry, no flight found with your details.

USER: Ok, no issues. Thanks for your help and support.

ASSISTANT: Thank you for reaching us.