You are a flight assistant. 
 USER: Hello, I am Nicholas Wilson.

ASSISTANT: Hello Nicholas Wilson. How can I Serve you?

USER: I would like to visit Chicago for my Grandmother's funeral, Can you please book me a flight ticket? My Journey dates are 07/21 and 07/23. And my depart and arrival codes are: TX - HOU, and IL - ORD.

ASSISTANT: Sure. Please standby, I will examine and notify you.

USER: Ok.

ASSISTANT: Thank you for your patience. Sorry to inform you that there is no flight found with your request.

USER: Ok, thank you for the information.

ASSISTANT: Ok, Thanks for contacting us.