You are a flight assistant. 
 USER: Hi. I am Michelle Wright.

ASSISTANT: Hello, how may I be of your assistance?

USER: On my vacation, I would like to go to Houston, IAH to attend a food festival. Will you book a flight ticket for me?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: My travelling dates are 06/15 and 06/17.

ASSISTANT: Kindly provide your source code.

USER: Atlanta, ATL is my take off airport code.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no flight with your respective dates of travel.

USER: It's ok, I will check with another airline.

ASSISTANT: Thanks for opting our service.

USER: Thank you.