You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I help you out?

USER: Please book a ticket from Chicago, IL-ORD to Houston, TX-IAH, for holiday vacation.

ASSISTANT: Ok. For booking a ticket, we want your journey dates. Will you please provide this?

USER: Sure. Departure is on 07/19 and return by 07/21.

ASSISTANT: May I have your name please?

USER: I am Sandra Mitchell.

ASSISTANT: Thanks for your time. We found that there  was no flight that matches with your information.

USER: Thanks for the help.

ASSISTANT: Thank you and have a good day.